i'd like to add as a SP in D2 after completing hell in low 80s, i had the option of item finding while leveling, in D3 all i will have is item finding! achievements are pointless & no pvp obviously for SP. Another thing, all the best gear will proberly be L60 requirement meaning i can't even use it for an alt before finishing the game again... i feel D2 will have a longer life than D3 for single players like me. :(
What about the endgame content Blizzard has planned for D3? They've said there's some unannounced endgame stuff to challenge max level players in it.
D2 had -no- endgame content of any sort, just runs of various bosses, and PvP.
I think D3 will have a lot more to do after you beat it than D2. You lose levelling, but you're gonna gain a lot of other stuff.