Bedrockgames
I post in the voice of Christopher Walken
Well, what's your measure of popularity - whether people play it, or whether people say they like it most?
If the latter, then the most popular game doesn't have to be the most widely played. The most frequently visited restaurant in the world is probably McDonalds, right? But that doesn't mean people actually *like* it most.
I think the cross-over between play and popularity is so close it doesn't really matter. If people say something is their favorite game, chances are they are playing it. Sure there will be cases where someone likes a game but can't get people to play it with him, however by and large I think it is a wash. That said, for me the ultimate measure for "biggest" game is how many people are playing the thing. That is the game that has the most energy behind it in the hobby.