Unfortunately, EA released a terrible product this year. Those who play the PC version are lucky because it's easily (more or less) patchable, but you- on the XBox, are screwed, the way I understand it.
The bug report thread is here:
http://www.nbaliveforums.com/ftopic42263.php
It lists all the problems with the game. The PC patch EA put out fixed some of them, but of course, that's just the PC version.
I'm sure someone will be able to help you with some sliders stuff to at least make it bareable, though. Good luck. There is help/discussion about sliders in the following link, discussion should go there:
http://www.nbaliveforums.com/ftopic41801.php