Stormcloaks are anti-Altmer and that is why I go with them. The Altmer are the real enemy here IMHO. They have their fingers in everything attempting to direct the outcome. Smart, yes. Unsavory, yes.
Thalmor.
Altmer =/= Thalmor.
Thalmor were originally nothing more than a puppet goverment of Valenwood, created by Altmer primarily to fight the piracy that plagues Summerset (and were officially dissolved when Tiber Septim conquered Summerset).
After that, none of the three sides of Altmeri
civil war (Traditionalist, Imperial Symathizers and The Beautiful) respected them... you might as well say that Thalmor was a joke to them.
Than the Oblivion Crisis happened and through lies and deceit, Thalmor grew in power. Soon they started slaughtering the Altmeri Kings and nobility and slaughtered every Altmer who did not support the Thalmor. If you met the Altmer Legionaire in Rift, he would tell you a story that would reveal why the Thalmor may have REALLY attacked Hammerfell (a province that means little to the Thalmor): many Altmer lived there and Thalmor wanted to slaughter every one of them. "The Great War" says that Thalmor retreated due to Redguards kicking their ass, but after this story I wonder if they retreated simply because they finished their mission.
With that said, Stormcloacks are (interestingly) not anti-Altmer. The two Altmer who live in Windhelm are greately trusted by the Nords, to the point that they would put their life in hands of the Altmer stall merchant should the Thalmor somehow conquer Windhelm (as shown by a conversation bet ween the merchant and a Talos worshipper).
And honestly, these two Altmer are all the proof that the Stormcloakcs are NOT racist (thats not to say that they are as tolerant as the Empire). Else, these two members of the race that Thalmor represents would not be in the city, yet alone highly respected and trusted.
Thats just my feeling from talking to people in game, and an objection to the people claiming that half the nords are for ulfric and half for tullius. Its clearly NOT a 50/50 divide.
Stormcloack Nords are just more loud (and hot-blooded) than the calmer Imperial Nords so it is to be expected that you won't get the smae impression from simply speaking to people.
Seconded! Legion doesn't sit too well with me. They're nothing but trouble.
State of most provinces while there is Tamrielic empire: stability and peace most of the time.
State of most provinces while there is no Tamrielic empire: anarchy and constant wars.
It is not for no reason that the Empire survived for so long (I am here talking about all five Empires: Alessian, Reman, Akaviri Potentate, Septim, Mede) and why ther are so many people in every province (even in Summerset Empire was popular... and Altmer had the least reason to like them) minus Morrowind (where imperial Authority was non-existent due to Tribunal's cunningness) who support the "Opressor".
In summary, saying that they are nothing but trouble is terrible jumping to conclusion... but than again, Stormcloacks do like jumping to conclusions.
My fear is that, with how and when Ulfric chose to use the power of the voice, this may, to some degree, have corrupted him, turning him away from a divine path. Naturally, I do not assume that the degree to which Ulfric may have been tainted by his own actions is anywhere near what is encountered in the Winterhold quest line. However, I do believe that the amount is sufficient to warrant a reasonable amount of concern.
Ulfric is definitely not a Saint. Alongside historical evidence (squashing the Forsworn Rebellion (which is identical to what he does now), slaughter of Reachmen cilivians, being a Thalmor agent (he aoon broke all contact with them soon true but the fact remains: he is not that clean concerning the Thalmor as some claim it)), but we also have few Jarl's not trusting him too much (even if they support him) and even the Stormcloak soldiers start to doubt his niceness with time (as shown through Ralof).
The Empire's professional, organized and resourceful army has quite a difficult time eliminationg a 'rebellion' (in that there is a stalemate until the Dragonborn intervenes).
Of course they will have a difficult time. This is a Cyro-Nord Empire and it was always a common knowledge that majority of its army is Cyro-Nord (both in Septim and Medes Empires). If it happened in any other provinces, the rebellion would be ended soon as other races make only small (insignificant) part of the Legions. But Skyrim Civil War means that a big bunch of Empire's Legion (and youth trained to fight for the Empire) is now the enemy of the Empire. Skyrim is the province that would be hardest to re-conquer (well besides maybe Black Marsh and its "hospitable" terrain).
High Rock is a wild card. Hammerfell is crucial for whoever wants to win the war, and Hammerfell has a lot more reason to unite with the Skyrim than it does the Empire.
High Rock would want the Reach, which was given to Skyrim by Talos, back and they may not be too entertained by Ulfric's buthering of Reachmen which are a Breton people.
Nords don't seem to like Redguards much for some reason (the "Warmaiden" says she would have been kicked out of Whiterun if she were not married to a Nord and youwoul expect them to treat the anti-Thalmoric Ali'k better as well) so doubt these would two ally either.
And lets not start about how in history Skyrim was constantly violent towards these two races, ALWAYS attempting to spread its borders over their lands (and in other times helepd Cyrodiil conquer them). High Rock and Hammerfell have little love for Skyrim.
Redguards and Bretons may actually form their own alliance should the need arise (their relations have been getting better throughout history) and the mix of Warrior/Mage nations would make them a formidable defensive against the Thalmor. And since they don't need Skyrim in alliance and both have lands Skyrim took from them... it is quite likely that Skyrim would get invaded by these two... especially after Civil War weakened it.
And what must be done? The Stormcloaks are more eager to destroy the Dominion than the Empire, that's good enough.
Nords are just more straight-forward than the Cyrodiilians which tend to believe in discipline and calm preparations.
Also, if Imperials did not want to fight the Thalmor, they would not constantly speak as if they are preparing for a war against them.
Well first off I would like to ask didn't the nords come from up north and slowly go down south into tamriel and skyrim? Just wondering. But anyways...
Nords came from Atmora, stole Skyrim from Falmer and Aldmer who lived there and... well, thats it. Cyrodiilians sometimes claim they are descendants of Nords (to strenghten the alliance with Skyrim they had since the First (Alessian) Empire), but they are actually Nedic and were in Tamriel before the Nords came. Bretons are also Nedic.
However, first Nordic Empire (which existed alongside the Alessian Empire they helped form and were tightly connected to) conquered Morrowind, High Rock and (I think) Hammerfell so they did spread, just not south...
Buying time doesnt work when the other side gains more than you do. The WGC makes the empire weaker not stronger.
Seeing as Elves need more time to get back onto their feet (due to slow reproduction and usual Elven slowness), Imperials have the upper hand here...
...until you take into consideration what we know about Thalmor but Empire doesn't
They're never going to. The Stormcloaks want independent Skyrim. Any confrontation with the Thalmor is going to be a desperate defense of the province itself, not the crusade some of them may fantasize about.
Knowing Ulfric, he may invade for no other reason but to become a hero Nords would talk about for generations.
And Nords are suicidal by nature. Unless their Cyrodiilian brethren are there to calm them down, you never know what madness they may attempt after drinking some mead

; (but thats what I love about them)