what I liked about 3.5 was that it was insane, and the system was exploitable in ways the GM could not predict. it let you surprise even a railroady GM. there's a kind of vibrancy that gives to a fantasy world. I think for a lot of people, that was the first time they saw anything like that. it was a tedious 90s/00's kind of good.
it was tedious, and required knowing far too many rules. it was a tedious sprawling 90s/00's kind of shitty. I don't think it was a good system on balance, I just think it's better than any other D&D, unless pathfinder counts.
and you can absolutely play a non-wizard, you just have to be as broken and weird as the wizards are.