I played roblox back in '07. Then a bunch of idiots moved in to the community, these idiots mainly consist of these three demographics:
1. Politically correct dumbasses.
2. Spoiled rich kids.
3. Lighters(Kids that flame people all the time).
It's very complex, but yet very simple. Snaffle's right, the ratio of unintelligent to intelligent would be 5:1. Trust me, even the moderators there don't like the community.
Roblox is still a pretty cool game, the physics and lighting are the main reason for ANY lag that happens.