One of the best games for the PSP, and it's so underrated.
First, there is Exhibition mode. Where you choose a team and play with them throughout the season. You can trade players, cut players, call a team practice, and try to be the best. It's so much fun that you'll almost never want to put the game down.
In Exhibition mode, there a couple a things should mention. First, The graphics definitely aren't as good as the PS3. Don't get me wrong, the look pretty darn good, put it just can't compare. Next, the sound is kind of annoying after a while. All you here are the announcers comment about almost every play five seconds after it happens. The controls are different than the past NBA games, but they're pretty easy to get used to.
Then, there are the minigames. The minigames range anywhere from dodgeball to conquest. Almost all of them are really really fun. You get to play as that team and play through all the levels. Then you get tickets. Tickets let you buy past jerseys or arenas for other teams. This makes the games replay value very high.
All in all, this game is one of the best I've ever played for the PSP and might be stay that way for a long time