I don't see what the big deal is.
It's not like the Bengals blew the Steelers out of the water in the last game. 16-10 was perfectly winnable.
Steelers Offense is probably at where they would have been if Ben had not been injured for those 4 games. Remember that Ben had just gotten back from his injury and it was his first time on the field with all of his starting WRs and then we lost Bell mid-stream. Our Defense handled the Cinci Offense just fine, but our Offense was just finding it's legs again. I don't expect the multi-turnover game that happened in that first game.
This time, the Cinci D is down 3 starting defensive backs from that last meeting, and the Steelers Offense has been firing on all cylinders. I expect the Steelers O-line to be playing with attitude and the Defense will be fired up to prove they belong in the playoffs.
Steelers 28
Bengals 17
I also think our left tackle has improved quite a bit since the first game against the Bengals.