Confession time: I hate playing games with children.
I just spend close to an hour with Seth, being told that he won he won he won (despite clear evidence to the contrary), and "I'm the boy of the house so you have to listen to my rules" (which I soundly denounced), and no-that's-not-right-you're-doing-it-wrong!!!
Nothing brings out my desire to yell "I was playing this before your parents were even married!" like trying to play an organized game (memory, uno, even doing puzzles) with the three to, oh, ten crowd.
Though I should disclaimer here that I actually don't really like games in general. But particularly not with children.