Vrabel is overrated, in my opinion. The Titans are a tough team, but they are pretty basic and predictable as far as schemes go. And Vrabel makes questionable in-game decisions. I see the NFL passing him by in a few years.
The Titans are not some juggernaut. They've gone 9-7 for years and play in a weak division. They had a nice run in the playoffs last year and good for them. But they play a dangerous style of football, barely beating opponents. They do not have an explosive offense.
They are a good, physical team that you have to be ready for, but that's it. Nobody should fear the Titans.