1) No auto-hitting: Everyone has a chance to avoid the attack UNLESS it's like an ultimate move.
2) No avoiding EVERY attack: You don't have the ability to dodge every attack thrown at you, that's totally un-fair.
3) No Super-Heroes: Everyone wants a equal chance, so no super-heroes. That detracts from the fun. If you want to God-mode, beware of administration action.
4) Please be logical, idiodicy is not appreciated.