LOADS AND LOADS OF FUN
Not only is the gameplay addicting, there are a bunch of cool features like NBA Live's signature All-Start weekend, where you can participate in the Rookie Challenge, the Slam Dunk Contest, the 3 Point Shooting Contest, and of course, The All-Star game. There is also a season and a playoff mode, what dissapointed me was the lack of a dynasty mode, because that and the fantasy draft in it is what i think is that best part of basktball games. I usually play dynasty mode the most on the not portable versions. What is cool though, is the Superstar Challenge, where you can take control of an NBA superstar in the final minutes of a game in a real game situation that actually happend in the 2004-2005 NBA season. It will keep you occupied for a while.
Since you change the difficulty settings, you can make it so its just right, unless you are so good, that superstar difficulty is just too easy for you.
The online can be fun, but annoying because it takes forever to make an acount, then, there arn't too many people playing anyway.
The graphics and sound are great for a PSP game, though, keeping you occupied on a trip is more important.
Overall, this game is one of the best and worthwhile games on the PSP, plus, its extreamly fun.