The ESRB is an industry voluntary organisation that helps the industry avoid government intervention. "Sticking it to the man!" in this case is counter productive, if you deliberately undermine the ESRB you risk laws coming in to place that are more than likely harsher to video game enthusiasts so rage against the machine isn't going to help anyone.
Censorship is often unnecessary, age regulation is probably a very good idea. ESRB does age guidance, it's games companies who censor their own games to achieve age ratings for their games.