General consensus in past games has been that it's pretty darned evil. However, the closing of the gates and subsequent shortage of Grand Daedra souls seems to have caused most people to make a compromise with evil. In other words, it's evil but convenient, so hey, look the other way. Times change. You're living in a time when it's looked down on significantly less than it has been in the past. Very few people rise above the morality of their era, so if your character does it, that's pretty much par.
My character (who has been around long enough to remember when most denizens of Tamriel had better morals) doesn't do it, which seriously cuts into her enchanting.
By Grand Daedra souls, are you referring to the Sigil Stones? I've never thought of them being souls before. Always thought they were some form of padomaic creatia balled up into a... ball. But they are
pure evil. I've spent hours reloading games in front of Sigil Stones hoping for that light enchant or fire/frost/shock shield. One time it made me late for a math test. Like I said pure evile.
I love the Sigil Stones regardless because they helped me understand Tower and Stone theory. I'm not sure if it was intentional on the dev's parts or mere coincidence that the Daedric pocket realms were stabilized by stones sitting at the tops of towers.
Cut theory apart on dotted line ---------------------------------------------------------------------------------------------------------------------------------->