This is a hard question to answer. I cannot actually remember ever having a compliment while gaming. The best compliment about my games must be that fact that the players keep coming back, and that they are prepared to travel half way across the country and spend good money on renting a house and all that sort of thing just to be able to play.
If I think about that in the cold light of day it is actually very flattering. So that is my answer for today’s question. Sad to say no one has ever said “OMG you are an amazing GM!” although that would be a little embarrassing.