Gosh I once got an Ichiro Roll at a Mariners game - first time I ever got sushi at a ball game. I have seen more and more ball parks getting higher quality food - not sure about the added vermin though. Red Sox has Legal Seafood chowder; I gone to a minor league game where they have a local Mexican restaurant that serves food - the burrito was outstanding.
Honestly, I'm not gonna worry about the stray bugs, rodents, etc. It would ruin the experience - fortunately for me I have a pretty strong stomach.