As I understand it, and as others have said.
The Aedra are the lords of creation, as such they are considered "true gods" they rarely get directly involved with the affairs of mortals and either can't or won't get directly involved with the daily affairs of mortal lives.
The Daedra are the lords of change, they don't actually create anything, they just change what's already there. As such they are not "true gods" but they are worshiped as such. They often get directly involved with the affairs of mortals in one way or another. Though they may sound annoyed when you summon them, the fact you can summon them at all is proof of this.
Both approaches have positive and negatives.
Aedra are akin to Jehovah, in that they're more about letting mortals make there own decisions, and the freedom to make there own choices. However they can be seen as distant, and uncaring. Which leads many to Daedra worship.
Daedra can show a concern for there followers, but they also see followers as some kind of possession and can use and abuse them as pawns or playthings.
The quest's Daedra set you on can often reflect how they feel about mortals.
Some of the Daedric princes have noble traits, specifically Azura and Malacath, who do show concern for their charges. Or Meridia, who's goal is to abolish the undead.
Other's are pretty much neutral on the subject, specifically Nocturnal, Sanguine, Peyrite, Hermaeus Mora, Namira, and Clavicus Vile to a certain extent.
And others you really have to look hard to find any noble qualities as they totally embrace "mortals are playthings to be stepped on" Hircine, Mehrunes Dagon, Mephala, Boethiah, and Molag Bal all fit this bill.
Sheogorath is a complete wild card, and trying to determine his true motives, is like trying to comprehend the meaning of life while on crack.
With all that said....The Queen of the Night Sky, and that sixy Daedra with the Scottish accent better damn will be in this game.
i dont think id put Hircine in with the bad bunch
he does brutally hunt people down like animals, but he does make sure they have a chance to beat him at all times
i think he's more chaotic neutral
hes less "mortals are playthings to be stepped on" and more "im definitely above mortals, but theyre are impressive enough to merit my respect and fairness"