Carolina and Tampa are actually doing a much better job of late. Remember Atlanta gashed them for 254 and 306 the first and second game of the season. That has a way of really screwing up your bell curve.
Cinci is no surprise to me. Their run defense has always been vulnerable. In fact, their whole defense is a bit iffy IMO. It's just all the interceptions they get that makes people think that Cinci has a good defense. But I suppose rolling through the NFC North last season helped a lot with that. I think they picked off at least 5 from each NFCN team last season.
Indy's inability to stop the run after what they did last season was a bit surprising. Makes you wonder if what they did last year was a fluke or if injuries have hurt them that badly.
Carolina and Tampa being on that list has hurt a bunch of fantasy owners in the early weeks. I used to have Carolina and I regretted drafting them after they played Atlanta. Good thing I picked up SD after week 1.