I kind of like potlucks at work because we've got so many different cultures represented. There are Indian dishes (often cooked by the wives of the men who work there), traditional french dishes, and some Irish dishes too! And then there is always some fried chicken too.
I generally bring something storebought too, though its only because I can't really cook.
The past two potlucks at my work have been AWESOME. Everybody brings excellent food, and we make sure to have vegetraian options too. The key to potluck is to have a sign up ahead of time.
I don't eat everybody's food so I look for the containers I know came from the store or I don't eat it. I am usually hungry after work potlucks.
There was a woman at my current job who told some of her coworkers thta she lets let dogs lick her dishes before she put them in the dishwasher. She was hurt when no one ate her dish.