The "Cromartie can't tackle" thing is getting out of hand. He was a sound tackler this season and not a liability in run support. His lack of physicality was mostly an issue in terms of him not jamming the WR at the LOS. "Cromartie can't tackle" is right up there with "Braylon can't catch" - an unfair assessment based on reputation and not recent (the most relevant) performance.
You don't go through Indy and NE at their house in the playoffs by accident. The Steelers needed an awful call against the phins and an act of god against the Bills. The Packers managed to lose 6 games on the year. No team in the NFL is perfect and every team had a few games this past season that you could point to and say "See! They aren't very good."