Alright, I usually play most people, but here are the guidelines for playing other people I usually follow (these obviously don't apply to tournaments).
I'll most likely won't play, outside of tournies:
1. Teams with more than one DP
2. Teams with claw/rsc/MB combo (maybe with my orcs, never with elves).
3. Teams/coaches who have histories of being team destroyers.
Apart from that, it all depends on the day and how I feel.