Roblox is immensely fun, but the problem is,as said before, the community.
It's not that the majority are mentally handicapped, it's more of the fact that most of the players are young and immature, and as such behave differently to what more aged and mature gamers would expect of an online community.
Anyway, don't quit Roblox, play it on school computers or library computers, whatever, just don't get caught :V