MONTANA is number one in history, BRADY is number one today, no question. If stats where all that counted, then Montana would'nt make the top five, he just wasn't that durable. But when he played, he was definitely the best the world has ever seen. And yes, Superbowl performances do count a lot. The best athletes always perform their best when the stakes are highest. That is why you can't say that Alex Rodriguez is the best baseball player ever, even though he has the stats to make a very strong argument; until he proves he can deliver at the most important of times (championship play), then we will have to consider A Rod the most productive player of his generation, possibly ever, but not the best. Tom Brady, even if he did come up short in the most important game of his life (Superbowl XLII), HAS delivered, he is a great quarterback and his place in history is secure forever. But he is no Joe Montana. Nobody is. Yet.