I would say Bush is overrated based on his hype coming out of USC. People were comparing him to Barry Sanders. He looks like a decent Westbrook type that will net 1,000-1,500 yards rushing and receiving, but right now he isn't even the best RB on his team (McCallister). And he is certainly no Barry (YPC is nearly 2.0 yards below Sanders' career average).
I am a UT guy, and I really like Vince Young, and you can't argue that they had a lot of success last year after he came in, and they're in the playoff hunt this year, but his stats last year and this season are pretty atrocious.