New Orleans vs. Seattle looked to be a blowout, but Seattle's home loss to the Cardinals a couple weeks ago proved they aren't invincible, and the Saints will want revenge for their earlier blowout loss to Seattle, so this one is a must watch.
New England is heavily favored at home against the Colts, but everything Andrew Luck does seems to defy reality, so you can't possibly count the Colts out, even if they're trailing by four touchdowns in the third quarter; definitely have to watch this one.
San Francisco was a huge favorite at the beginning of the season, but they've had their rough stretches; Carolina was written off by Week 3, and finished the season stronger than anyone in the league, so they're clearly no push-over. Two dynamic young quarterbacks backed up by a lot of talent on both sides of the ball? Must watch.
San Diego already beat Denver once on the road this year, so that's got to be looming large in the Broncos' minds, not to mention all the nonsense about Peyton Manning's postseason record and how he can't play in the cold. Denver's defense is unconscionably awful, but their offense is record-setting good, so this game could see records set for scoring by both teams; definitely have to watch that.
So the answer is all of them. All the games.