I'm a die-hard Colts fan, but I tend to play as other teams for some reason. Maybe it's to just see what makes that team tick, but I figure I already know everything about the Colts, so I like to mix it up.
I was actually thinking about playing as the Cleveland Browns and trying a ton of QB trickery with RGIII paired with Terrelle Pryor, or I may even ditch RGIII altogether and run a franchise mode trying to revive Terrelle Pryor's career as a QB. Either way, both QB's are insanely fast, and speed translates pretty well in Madden, so it should be fun.
If they have Tim Tebow or Peyton Manning as free agents, I'll also try signing them for lulz.