Call me crazy, but a game where kids build stuff, communally or individually, is about a bazillion times cooler than games where kids just zap each other with twitch reflexes.
1) Those building railways, roads, cities, redstone circuits, efficient automatic farms.
2) Those playing on "PvP" servers all day, attacking each other, fighting in arenas, clan wars, etc. (If you hear a constant "click click click" noise, that's probably them)
The ratio of type 2 to type 1 players is probably something like 7:3.
Type 2 relies on servers, while type 1 can be is usually done alone (on a server it typically ends in drama).