It is all about matchups and Seattle has been very good against traditional passing attacks the rely on yards after the catch.
Go watch what Seattle did to the Saints on Monday night. Brees had an excellent season (over 5,000 yards) and the Saints have a number of quality receivers and thrive on the short game (especially screens) like Denver.
Seattle destroyed them. 34-7 and Seattle, much like against Denver, could have scored quite a few more. The play off game is hard to judge as the weather was so bad but it is worth noting Brees was destroyed in the first halfworse half in a decadeand Seattle had a commanding 23-8 lead before Saints went into desperation mode (heave it deep, hope you catch it).
Seattle made traditional QBs suffer most of the year. Luck had a horrible first half (blocked kick and a fumbled kick off were big turning points on the road), Carson was killed by Seattle, Ryan, Schaub (Seattle was the turning point for him), etc. The last two years the Seattle defense has beat Tony Romo, Aaron Rodgers, Jay Cutler, Brees, both Mannings, Kaepernick, Newton, Ryan, Brady, and RGIII.
Seattle can be that good against traditional passers when they are on their A game. This is the same team with 150 points in 3 games at the end of last year; injuries to their line and receiving core were big set backs all year, and yet they still went 13-3 in the toughest division.
As for the NFC Championship, the 49ers were the "hot" team and chick pick. Their passing game was doing well as the 9ers were finally healthy. The 49ers have a great offensive line, 3 legit passing targets in Boldin/Crabtree/Davis, the best linebackers in the league (maybe best front 7). San Francisco had a hard schedule, including Seattle twice, and finished 12-4. With how bad the AFC defenses are the 49ers would go 14-2 in the AFC.
As for Denver, Seattle did the same thing to them in the preseason; yes, only preseason but it was pretty telling about the matchup issues. What I saw in Denvers playoffs games is that they struggled against an average, at best, San Deigo team and an injury riddled Patriot team. The Patriots had 1 legit pass defender who was injured. They had make shift receiving corp that could not exploit the BAD Denver pass defense.
For how great Denver was they weren't scoring much more than Seattle (24-17 SD, 26-16 Pats). And that was against far inferior defenses compared to the 49ers and Saints Seattle faced.
Seattle got some bounces their way (the free safety) but everyone who watched the Super Bowl saw Seattle out execute at every level of the game. It wasnt flukySeattle got pressure with 4 rushers and the Denver receivers posed no threat for yards after the catch. Denver was getting killed on the line of scrimmage. And on offense Seattle proved against an average defense. Denver sold out on Lynch and Wilson shredded them for 72% completion and him and Harvin took advantage of Denver inability to contain (71 yards on 5 carries). And of course Seattle special teams covered every kick well and Seattle exploited the WORST KO cover unit in the leaguedidnt hurt to have Harvin, the best returner in the game, back on the roster.
Even if Denvers offense had a much better day it doesnt change the fact Seattle was also killing it on offense and special teams. Denver is an above average team with below average defense and special teams carried by their great QB that lives on yards after the catch. That is a horrible match up against Seattle.
So I will base my statement on the matchups we saw as well as seeing Seattle do the SAME THING to another 5,000 yard passing team.
So what proof do you have that a) Denver could play a lot better against a top 5 Defense in scoring/pass yards/turnovers? and b) Denver's defense can regularly stop teams that can run and pass?
I won't even mention special teams--everyone knows Denver KO coverage stinks, Harvin is awesome, and Seattle kick coverage was historically great this season. (Now that I think about it, the two 300 yard passers against Seattle were losses where the loser scored 21 and 15 points.)