IMHO, ChatVille implementation destroys point of ChatRoulette. Simplicity and excitement of meeting random people is key of chatroulette success.
Also any game introduced to the mix, must not interfere with chat and game must be about “roulette” – gamble.
Plus with chatville there is a privacy issue with allowing people to just make snapshot of you and post on wall. Great!
The http://fbchatroulette.net which has game similar to FourSquare integrated with ChatRoulette – which does not make thing more complicated than they are.
It is pure roulette – you don’t to which part world are going to visit.