Summary: Unless you're playing online, there's really no need to upgrade every year. NBA 2k11 is an excellent game. Polished. Realistic. Really captures the atmosphere, mannerisms, and mechanics of playing basketball. The presentation is outstanding - broadcast, cut scenes, player likeness. This is the MLB the show of basketball. It doesn't get better than this. Get 2k11 if you're only playing offline.
Summary: I only played this game just a little bit, but enough to know that it's almost the same game as 2k10. I'm not saying 2k10 isn't a great game. It is! But there's no improvement. I hate it when there is a long year of speculation about the improvements next year's game is supposed to have and it turns out the same as last year. There are a couple differences but don't spend more money on 2k11 as apposed to '10; it isn't worth it.
Summary: nothing has been as good since this year, because they (2k) started f'ing around with the controller layout. so i will only play this and nothing else. even though i have ps4 and xbox one and wii u. I'll play xbox 360 2k11 any time someone wants to play basketball video game. bottom line.
Summary: If you plan on being a casual player of this game, don't bother. They use every possible combination of buttons to allow for realistic gameplay, I suppose. After a few days I was tired of trying how to learn to play this game and haven't picked it up since.