Cincinnati was a bad game all around, team failure, so I don't count that.
Defense didn't play well against Texans, Colts in the playoffs. They got shredded by the Chiefs 3 times.
They did well against Lamar in the wind game against the Ravens.
Played so so against the Dolphins and Steelers.
I would not say they have shown any signs of being a dominant playoff defense like legendary D's such as Ravens, Bears, etc. Hope this year shows me to be wrong though!