And the "gimme souls of all races" one from Hermaeus Mora isn't evil? Come on :3
I'd put it on the "personally unacceptable to ambiguous" end of the scale, but no-- not at "wholly evil." In the first place, in spite of the name, I don't consider the thing trapped by a soul gem to be an actual "soul" in the religious sense, but something more akin to "life energy."
In the second place, that quest can easily be completed by cleaning out a bandit dungeon, a marauder dungeon and a necromancer dungeon, and we do that all the time. It just requires the extra step of trapping the energy released by the people we would've killed anyway.
Now-- one might question the morality of all that killing in and of itself, but if one takes a firm stance against that, the game's just about unplayable (I know-- I have one character who's a complete pacifist).
I forgot which it was, but the "free the ogres" one shouldn't count as evil either, right? Unless I remember incorrectly and there was something more to it.
That's Malacath's. It's one of the ones I see as fairly ambiguous. The fate of the owners is a bit harsh, but also a bit fitting. I actually feel a bit worse about the guards than about the owners, but so long as it's the ogres doing all of that, I see that as pretty much the way it goes.