D3 suffered from too many puzzles, mission-based levels (half the time I didn't even know how I was supposed to accomplish the objectives, it all seemed very unintuitive), and an inferior set of weapons. And the Guide-Bot was made annoying
. At least in D2 you could choose to stay away from him (or never release him at all), and he didn't have beeping as his "vocalization" (oh, how I hated that beeping. Shut up, GB, just SHUT UP!)
Well, in my opinon, anyway. It's not all bad, though: I did like the inclusion of outdoor areas, and the levels where it was the good old formula of entering a maze and blowing **** up all throughout were awesome. I liked the bosses too, they had much more variety than the old bosses... I remember the Homunculus in particular being great fun to fight. And then there was that hilarious reversal of roles during the CED's attack on Red Acropolis, with you defending the reactor against the robots.
I pass no judgement on the multiplayer, as I never had an opportunity to try it.