I've always preferred custom classes. I remember in sitting in Highschool carefully plotting out my primary, major and minor skills for at least a dozen or more different characters, and then trying to figure out what stats I was aiming for, what my background was, what factions liked me and which didn't, and of course, what my race was(Due to reading a lot of Forgotten Realms at the time, primarily R.A. Salvatore Drizzt books, a lot of my race picks ended up being Dark Elfs. LOL). I am quite certain that I used up at least one full notebook intended for some subject or another, filling it up with all the different classes I'd made. It was so much ^^ I did the same with Morrowind, though I was already out of HS by then, so instead I'd just write on notepad on my comp.
Premade classes have never really held much attraction to me, and I honestly don't imagine they do for many other people either, unless they just want to jump in the game that much quicker without having to worry about figuring out stats and skills and the like.
What about you all?