Yeah..for a decent computer like mine (pentium III 733 with 96 megs of ram), you would need to set the details to the minimum so that the gameplay is not choppy, especially when shooting the free throws.
I never have difficulty winning in Superstar anymore. The money plays (run between your best outside shooter and his man and pull up...when both his man and your man jump to block you...pass back to him for the open three) work pretty consistently...and dumping the ball into the post makes it very easy to score.
I have had the occassional game where the computer continually traps you in the fullcourt and your other backcourt guys refuse to move to give you any help...and your shots seem to refuse to go in. In those cases if you just hang in there and make smart substitutions you can beat the computer with a 10-0 run or so in the fourth when he refuses to sub his starters out for the whole quarter.