I can't read through all of this right now, but I'd say a couple things:
1. I love Joe Montana. I am not old enough to have seen him play at ND, but he was my favorite NFL player when I was a kid and obviously that he is a ND guy only makes him more of a favorite. (Actually, that is the way I look at it now, but really Montana is a big reason I became a ND fan as a kid.)
2. I think if you're going to name a Greatest Ever, for QBs it has to be some combination statistical accomplishment and team success because of the nature of the position.
3. Tom Brady combines those two areas better than anyone that has ever played. You could make a case for Brady being a top-3 QB of all time using either of those measures, and the same cannot be said of anyone else that has ever played.
4. Brady will pass Dan Marino and has a realistic shot to finish ahead of Drew Brees in passing yardage, which would put him third all-time. He will also pass Marino and has a realistic shot to finish ahead of Brees in passing touchdowns, which would also put him third all-time. He is currently fifth in career QBR, but it is very reasonable that he could be second by the end of next year if he has a good season - he is percentage points behind Steve Young, and within two points of Manning and Romo. The guys on all these lists with Brady (Manning, Marino, Favre and Brees) have combined for three championships - less than Brady's four.
5. Only Terry Bradshaw and Joe Montana have won as many Super Bowls as Brady. Montana is 13th in yardage, 11th in touchdowns and 10th in QBR. Bradshaw is 53rd in yardage, 31st in TDs and 137th in QBR. (Obviously they all played in different eras, but those differences are stark.) Brady has won more conference championships than any QB in history, has the best career winning percentage among QBs with enough starts to qualify, and he will soon pass Brett Favre and likely Peyton Manning and retire with the most wins of any QB to ever play.
6. Someone in this thread said that Tom Brady is a game manager. Tom Brady has played exactly one full season with an all-pro caliber WR (Moss in 2007), and he threw for 5000 yards and 50 TDs! The 50 TDs were the most ever at the time, and his 117 QBR is still the fourth best season in history. He is also a two-time MVP. Also, see no. 4, above.
7. Someone in this thread wondered whether Tom Brady won last night's game or Pete Carroll lost it. I can't pretend like Carroll's play call at the end didn't help the Patriots, but Brady went 13/15 for 130 yards and two TDs in the fourth quarter to pull off the biggest fourth quarter comeback in Super Bowl history against one of the elite defenses in the history of football (which had given up one second half TD since October). So criticizing Carroll is fair, but it isn't like the game was just handed to the Patriots. Brady played arguably the greatest fourth quarter in the history of the sport, considering the stakes and the circumstance.
8. I kind of brought this up before in no. 5, above, but it is crazy to me that people would say "Joe Montana is better because he never lost a Super Bowl and Brady lost two." That is arguing that losing in the divisional round or not even making the playoffs at all is better than winning your conference. That makes no sense.
9. Fuck Michigan. Just so we're clear.