As I was pointing out with the Scherff nomination earlier...Pro Bowl noms a lot of the time aren't the best measure of who are really the best year to year at the position. That Ravens team was 4-5 last year with Flacco, went 6-1 with Jackson. They lost a good number of their main contributors on defense but the offense has helped make up for it keeping them off the field this year.
Also frankly, even as bad as Pro Bowl selections/snubs normally are, the NFC as a whole is a bit more competitive for spots than the AFC would be. Seattle, San Fran, Green Bay, and New Orleans are all 11 win teams, and the Vikings have won 10 games.