First and foremost, I am not saying that they are going to win it all. However, I would not classify this team as a "bye week" for anyone playing them.
Back to 2007,
Pretty sure nobody picked the Giants in any of the playoff games they played in. Seriously, did any one of us even think they would have made it that far? If you say yes, you're probably lying. They had a coach on the hot seat and an inconsistent QB who was yet to win a playoff game. With a heavy dose of pass rush and a little bit of luck, they somehow managed to beat Favre and Brady in back to back championship games.
Now onto the Bengals,
Marvin Lewis is a coach who has been on the hot seat quite a bit. The Bengals are a team that have made the playoffs a fair amount in the last 4 years, but have yet to win a game. They are led by an inconsistent regular season QB who is yet to win a big game. That being said, the biggest thing for me is their Dline. Geno Atkins is a beast, anytime you can get interior pressure, you have a chance. Michael Johnson has quietly amassed 11.5 sacks while Carlos Dunlap has shown 10 sack potential.
This team is capable of getting pressure without blitzing. That is the recipe to beating the Brady's and the Manning's in the world. As long as Dalton doesnt stink, they actually have a decent chance.
Again, I'm not picking them to win the Super Bowl. I probably would not even pick them to beat Den or NE if it comes to it. Just saying it would not surprise me one bit if this team put together a good 4 game stretch. Also would not surprise me if this team was one and done, they make for a good underdog