My only expectation for any roulette(other than Mentor) is for people to do their job per whatever role that they join as. For it to go smoothly if no one is new to the duty, and for people to ask for help if they need it.

For Mentor roulette on the other hand, I expect other mentors to be willing to help with WHATEVER they get through it, and not throw a fit when people refuse to kick them because they refuse to help/take the penalty for leaving themselves.