The Divines are evil. The Daedra are good. Say whaaaaaat?! You heard me. Let me break down a few things to shed some light on this revelation.
All of the Daedric quests in Skyrim, even those given by clearly Evil entities like Molag Bal can be viewed as ultimately good in nature. Let's look at the first extreme example I've already mentioned: Molag Bal.
In Molag Bal's quest, it starts off ominously enough with a Vigilant of Stendar asking you if you've seen any activity in this abandoned house in Markarth as he believes it to be a site of Daedra worship. You can elect to help him investigate the home and by doing so you start the actual quest line. You enter the house, and check things out, reaching a sealed door in the back. The Vigilant freaks out stating, "This is no ordinary Daedra," and flees toward the front of the house, where upon you both find that the way out is barred. A voice, the voice of Molag Bal, speaks to your mind instructing you to kill the Vigilant. You can choose not to, of course; but the Vigilant soon succumbs to the whispers in his mind and attacks you, forcing you to kill him in self-defense.
After doing the deed, Molag Bal beckons you into, "the bowels" and you're forced to do so as the way out of the house is still barred. You make your way to his alter, and are instructed to take a closer look at the rusted mace sitting upon it. When you do so, you are trapped in a painful spike trap and Molag Bal instructs you to trick a follower of Boethiah to come to this very spot so he may corrupt and take the person's very soul.
Seems pretty evil, right? Well, look at it this way: You didn't have much of a choice in killing the Vigilant, and while you CAN refuse Molag Bal's demand to bring in the priest of Boethiah, you need to realize that Boethiah is almost as bad as Molag Bal and her followers perform ritual sacrifice and spread violence and chaos. You don't even need to lie to the Priest; you can tell him Molag Bal wants him. He still goes. When you return, Molag Bal has you beat the man, to death, resurrecting him so you can beat him some more until he pledges his soul to Molag Bal. Evil? Again, when seen from the right perspective, your actions here could be considered neutral at the very least. The Priest had already committed his soul to Boethiah, whom we've already established is not a very nice Daedra. So what is the harm in merely shifting who/what gets his soul?
Without going into too many details, I will touch upon some other Daedric quests to show how Good they actually are:
Boethiah has you bring a trusted ally to sacrifice at her alter in order to start the quest. Evil? Depends on who you bring, I say. Perhaps you are a master of disguise and deception, but want to bring peace to the world. So you infiltrated the Dark Brotherhood (whom also can be seen as Good, as all of the assassinations you perform are on people who've done some pretty evil deeds), befriended the people there, and then bring one to be sacrificed to Boethiah. After that nasty bit of business is out of the way, what Evil acts does this Daedric Prince want you to do? She wants you to kill her followers; first in a battle royale to prove your worthiness, and then another group of marauders lead by her current champion. Clearing out a lot of nasty people in the world; not really a bad thing.
Peryite is the Prince of Pestilence; he wants his disease spread around the world to help his influence grow. But what does he have you do? He has you, like Boethiah, kill his own followers. When greeted with the followers, and the evidence around the dungeon you find them in, it seems they were planning to spread an infectious, deadly disease around Skyrim by poisoning water supplies and vomiting on people. Killing them would save hundreds if not thousands of lives. A good act.
Mephala has you take a cursed blade away from a secret room in Dragonsreach and free her (or something to that effect) from this room. By doing so, you release a dark grip over the mind of an innocent child. What you do with the blade itself is up to you, and could be used for Good or Evil.
Vaermina's quest only has her show up toward the end; however, through the quest you find that your guide through the whole thing used to be her follower and has killed countless people in her name. All she asks of you to receive her token is that you kill Erandur before his ritual to destroy the Skull of Corruption is completed. Destroying the Skull, so Erandur says, is the only way to end the nightmares in Dawnstar; but by taking it and having Vaermina imbue it back to full power has the same effect. You could kill the man who's escaped his past transgressions and remove the Skull so that you can dispose of it properly elsewhere; or use it in your fight against Evil. This one is a thin line, but ultimately no matter what you choose can be viewed as good in the right perspective.
*deep breath* Alright, now that the so-called "Evil" stuff is out of the way, let's talk about the Divines and their quests. Almost all of them have Evil consequences.
In Whiterun, you can talk to one of the Priestesses of Kynareth about bringing the dead tree in the middle of the city back to it's former glory. To do this, you must first find a magic blade to obtain some sap from the tree the Whiterun tree was born from. When you arrive at the Eldergleam you find it to be peaceful and beautiful. There are a couple people inside contemplating the scenery and paying respect to Kynareth. However, should you use the Nettlebane to reach the sap, you cause Spriggans to appear and kill everyone in the Eldergleam. For what? For a stupid tree to blossom.
In Markarth you can help the Priestesses of Dibella find their new Sybil. Most of this quest is good, you rescue the girl who had been taken captive by Forsworn; but you never get a chance to tell her exactly what's going on, nor do you let her say goodbye to her family; you just basically kidnap her yourself and take her straight to the Temple of Dibella. Okay, maybe it's not Evil, per se; but you do act like a dike.
When helping spread Love for the Priest of Mara, some things could be viewed as Evil. The first set of lovers are mere teens. By letting them elope against the girl's father's wishes, you could be setting them up for misery and heartache more than a true Happily Ever After tale. There is no follow up though, so it's all based on how you perceive it.
And just look at Talos himself; while mortal he was told to unify the people by the Eight, which he did. However, he also completely wiped out a race of elves and was pretty much made a God by the other 8 Divines for doing so.
TL;DR - The "Evil" Daedra have you do more good for the land than the so-called "Good" Divines that everyone worships.
