I won 7 games in a row on pro then tried all star but it was a joke. 5 awful games. Gone back to pro. I guess a higher level might be ok if you don't use your teammates at all and do all the scoring yourself but otherwise have to avoid.
One other thing i've noticed is when opponents get an offensive rebound they seem to score almost every time immediately from it whereas if my teammates get one (which as i said is hardly ever) they then follow it up with a weak shot which is blocked.