Learned that it's unwise to assume that there will be anything edible at a "pot luck."
So these days I assume that the only offering I can stomach will be mine. I fix something I will like and can make a meal on. Sometimes I am pleasantly surprised by the offerings of others, but I don't count on it.
One odd thing about pot lucks these days, though. I can rely on others to provide something potable. There will probably be a couple of designer beers in the cooler that I've never heard of and one of them will probably be pretty good.