I got a chance to watch and play NBA2k10 for an hour yesterday and I walked awayn thinking one thing: If you loved NBA2k9, you are going to love 2k10. If you liked NBA2k9 but had some issues with the game, you will probably love 2k10. If you are tired of 2k basketball and hoping for a change from 2k9, you wont be happy. The game plays like a much improved, better polished and better looking version of NBA2k9.
Pretty good write up with clear cut pros and cons.