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In 2011, the Packers won the Super Bowl, and last season, they went 15-1 before losing to the eventual Super Bowl winner, the New York Giants, so they're a tough opponent.
To make matters worse, the Titans play them on the road. To make matters even worse than that, the Titans play them on the road in December.
Lambeau Field late in the season is one of the toughest places to play in the entire league, and it should be especially tough for a team that's used to Tennessee's moderate climate. The Packers almost never lose home games late in the season for that very reason.
Oh yeah, the Packers also had a great draft, picking up two underrated prospects in Nick Perry and Casey Hayward that should boost their defense and make it resemble 2010's team more than 2011.
However, I do think that their offense will be a little less potent with the loss of offensive coordinator Joe Philbin.
That said, they're still going to be one of the best teams in the league, and that, along with the ridiculous home-field advantage they enjoy at the season's end, will make them the toughest opponent the Titans will face next season.