I have bought every nba 2k game since 2k1 on DC and 2k8 is the second worst in the series (after 2k5). The gameplay is horrendous and completely broken. Say I'm about to shoot and want to pass to a wide open player next to me, my player might end up throwing the ball backcourt. The shots are completely random and perfect release doesn't mean nearly as much as it used to.
I thought I'd really enjoy it and when I saw that every time you jumped wasn't a foul (a la 2k7) I was happy. I soon realized there were dozens of things made worse in this years version. I'm not a 2k hater, I even bought all their football games, because they too were in the best in the sport, but this years 2k basketball is total garbage IMO. I sold it after about 3 or 4 games because of all the stupid things that happened.