If i could name only one thing, 4 ppl per game would be it. I was expecting at least the same number as in d2, 10-12 would be fine, perfect match for a common d2 clan.
I also thought 4 ppl suck. But as much as I would like to see more ppl in the game, with its current gfx it would really be a serious problem. D3 is just way too eye-candy. Implementing 8 or 12 ppl in the game would make it unplayable.
My major issues with D3:
- no stats (well... there are stats, but in fact they do NOTHING)
- no item requirements (only lv req, but no str req, dex req)
- runes available from the start
- no skill levels
- no differences between chars of the same class (if you make 60 lv barb and I make 60lv barb they will both be EXACTLY the same - no different stats/skills)
- no open PvP
- no replays
- no spectators
- no arena editor
I guess I could enumerate way more, but atm only those came to my mind ;P