As a big fan of Lawful Evil in RPGs, I fail to see your point. Furthermore, you got the Stormcloaks' alignment off by a bit, given Ulfric pretty much intends to set up a totalitarian nords only club in Skyrim that could at best be described as neutral-something given the 'good' jarl's penchant for ignoring crimes against non-nords and tolerance of a rather xenophobic atmosphere in his own hold and that's before we get into the SS/Nazi comparisons.
Well.
Evil is evil, is evil.
Apart from being more racist than the nords, more facist and happy about killing the innocent than the empire, killing hundreds of completely innocent people, what good is there to say about the Thalmor?
The evil who commit evil, without remorse, are according to a western view, psychopathic morons.
How many innocent people have the stormcloaks killed?
I see the Thalmor killing hundreds of Talos worshippers, who's only crime is their religion, and that are only the ones I encounter.
They also attack you when you express free speech.
The empire is guilty of letting the Thalmor kill hundreds of Talos worshippers. They have an AGREEMENT with the Thalmor, that express something like:
"
We, the Empire, allow the Thalmor to kill our sons, daughters, fathers and mothers who want to be free as long as they leave the rest of us alone and treat us not too unkind when we let them take over our country, thank you".
In addition, they kill people who are suspected of being Stormcloaks, and people who happen to be near stormcloaks, and do not care wheter their prisoners are guilty or innocent, but will kill them anyway.
When they take over cities, they let those who surrender live.
Thus Stormcloaks are not fighting for freedom, but for the lives of the innocent. Yes, and freedom on top of that.
Talos worshippers have one thing in common: They worship Talos.
That is the only reason they are being killed by the Thalmor, while the Empire protect the Thalmor agents and their interests.
(Ulfric is not a sleeper agent, the Thalmor only recognize him as a potential asset that POSSIBLY can be manipulated to unwillingly support the Thalmor cause through deception.)
...
So.
Thalmor: Kills innocents, attacks innocent people unprovoked. Evil ==> Bastards that deserve death.
Empire: Allows the thalmor to kill innocents, kills people just for the heck of it. Neutral ==> Bastards that deserve to be shunned
Stormcloaks: Does not protect the innocents outside their cities. Requires foreigners to integrate and follow nord culture while the foreigners are in nord settlements; Requires people to act like the Romans when they are in Rome.
Two of the factions outright KILL people of the remaining faction, random people who aren't even suspected to be of that faction, and people with a specific religion.
Yet you critizise the last faction for NOT PROTECTING people.
Which flaw do you consider the worst:
1: Persecuting and killing people because of their culture, religion or ethnicity (Thalmor)
2: Not protecting people, and requiring people to meet your culture's standards of honor (be able to defend yourself and your family, be loyal) before you respect and accept them (Talk to the successfully integrated people in Stormcloak settlements; They will tell that they are respected and that people who complain don't understand nord culture)
3: Killing the innocent because you simply don't care about guilt or innocense, and fight against the rightful leader of Skyrim*
* Ulfric won against the king in Single Combat.
The king KNEW he could not win -- but still accepted the challenge.
Ulfric challenged the king to prove that the king was unable to even defend HIMSELF,
to prove that the King was unable to protect his people.
...
The king accepted to gamble the throne to Ulfic knowing that he would lose.
What else is there?