The first time through, I was in the 35-40 range. There were lots of little quests I didn't bother with, and I didn't kill every monster.
My main class was Warrior, but I took a lot of skills from other classes. I liked scorpions and polymorph a lot, which took care of the boss fights until I found a frost weapon. I could have been any class, and my character would have played pretty much the same way.