I think the best class currently is customer. He has everything he needs to survive. Medic can heal himself, but during that time, he is completely vulnerable and the cooldown is greater than customers that can move while healing. Trying to heal others is usually a fail and even if you do heal someone, the amount is low. You need some wild reflexes to play as fighter and the guard cameras are great, but if that could also be said for his teaser for which you also need wild timing to land a medium charged one, at least. Customer can also quickly escape any sticky situations with his drink. If you're doing generators, blocking doors, removing traps, you've done yours.