re: "Don't worry, we have Brady"
I would dispute that heartily. The D was more to the heart of the problem in several of those PO games. They gave up long-extended clock-consuming drives to the NYG O in both SBs and they let the Ratbirds put up 28 on them.
The Off COULD have been IMPROVED w/ a better DEEP threat; but Getting Separation was NOT the issue. Forcing the opposing D to respect a deep threat and not play a S in the box to congest the middle was the problem; but again not the ONLY PROBLEM.
Of course there is more than one issue. THe game isn't black and white. But the #1 biggest issue in all four games was lack of WR separation. This lead teams pack the middle of the field and stack the box. This stopped the run and limited our top 3 guys- Welker, Hernandez and Gronkowski.
2009: Only had Moss. Our #2 option was Watson and #3 was Faulk. Brady threw 3 interceptions that day IIRC. This gave the Ravens short fields and momentum. Flacco was held to 23 yards or something ridiculous and the Ravens still won.
2010: Brady finally made a mistake. He threw an interception on a screen after 400 mistake free attempts or what ever the record was. All year we got by because Brady was flawless and we got easy turnovers. Brady wasn't flawless and the offense was shut down because Welker and Branch could get open against Revis/Cro and the Jets loaded up the box. Granted our OL completely crapping themselves was relevant, but part of that was Welker/Branch not getting open and Brady having to hold on longer.
2011: No "real" Gronkowski. The entire game the Giants had 8 guys in the box. Either they'd be there to stuff the run or immediately peel off into a zone. The last drive- the drive were Brady threw a "bad" pass to Branch was a result of Brady trying to slide it into a window. If he threw to were Branch was going it would have been an interception. This is just one example of the tough windows Brady was forced to try to fit it into the entire game.
2012: Ravens played a heavy nickle. I was convinced we were going to light the Ravens up if they kept Lewis on the field. Instead Lewis stuffed the run and we couldn't get anything in the middle. We had Lewis guarding Welker one play and we couldn't get the touchdown. That's because the safeties were cheating and Brady was forced to throw it into an impossibly tight window. Our OL played well, it's just our receivers couldn't get open deep to punish the Ravens for having their LBs cheat up to the line of scrimmage the entire game.
There are of course multiple things that went wrong in those games. Different things happen. But the biggest consistency is that our WRs were not able to make a play and get open. Teams loaded the box and the easy running lanes our rushing game got all year due to playing the nickel suddenly were no longer there.
The next biggest issue is turnovers. The past couple years our defense has looked better than it really has because it's been opportunistic and teams simply don't give away the ball like they do in the playoffs like they do in the regular season. Again, the 2009 Saints are the only team I can think of with a defense like that, that got away with it. And keep in mind they got to face two of the biggest playoff choke artists in league history to feed them interceptions.
Part of that is because teams play better in the playoffs and our defense simply isn't dominating. The other part is that our offense simply hasn't put the pressure on opposing offenses to score that it has in the regular season.