I just tried it for the first time.
First I got some broke, hobo, bummy, ugly ass wannabe gangster who looked like a douche. Then it switched some fat guy rubbing his dick. Then a random chinese girl.
Chatroulette is terrible.
What you described is what makes it popular.
Some guy was beating off and said "watch this..."
Then, he sucked his own dick. It might be kinda gay, but it was one of the funniest things I've ever seen.