A great running back and offensive line will make an OK quarterback look great.
Like Huard from Kansas City this year. The guy isn't an all world QB but the threat of Larry Johnson got him alot of one-on-one when they brought the strong saftey up, and also got him alot of Cover 1.
Any so-so QB with a great line can drop back in that situation and find someone open.
I mean how great do you think Manning would be if he didn't have Faulk, James, Addai, Rhodes and one of the best pass blocking offensive lines in the NFL.