NBA 2K6 delivers a solid basketball game for the 360.
The A.I. in the game is rather good. I can't seem to remember the last time I've lost to the A.I. on default difficulty. Another nice thing is that they do not do it through impossible shots, but rather play with skill to beat you.
The graphics in the game are some what of a mixed bag. First of all the players look down right amazing. It some times hard to tell the difference between the game and real life, especially when at the free throw line. On the other hand coaches, fans, and refs all look terrible. In fact it is basically current gen displayed in HI-DEF.
I have two big problems with this game. The first is the presentation. Due to the fact that they don't have any official license it kinda feels shallow. My other problem is that other then the graphics there are no real improvements over the box version. So if you already have it than there is no point in paying $70 for virtually the same game.
Overall NBA 2K6 is a solid B-Ball title. It offers a wide variety of modes, but if you've already picked up the current gen version, there's no need to pick up this one.