I always enjoy seeing Mathis doing well because he is the prime example of the benefit that a team gets from having two very good players at complementary position. Nothing annoys me more than having an All-Pro in one spot (e.g. DE, CB, S) and a JAG on the opposite side. It. Just. Defeats. The. Point. Sure, you can scheme to get added value from the All-Pro by shading coverage or exploiting double teams from the opposing OL, but you can't beat having a lockdown unit.
Interestingly, since we were talking about the Colts, the only other team (and here I'm going to be controversial) with a great 4-3 front is the Vikings. Most other teams have one great DE and one JAG, which really lets them down.