Honestly I think the ESRB is a decent idea. Films are rated, as well as TV shows. It more or less just gives parents an idea of what may be appropriate for their children, and if they want to look into the particular game/movie/show and see what it's about and if their children are able to handle it then more power to them. I'm over 18, so it doesn't affect me anymore, but when I was a kid my parents actually paid attention to games, movies, shows, and music that I enjoyed. They were fine with pretty much all of it because they realized I wasn't a psycho. It's more up to the parents than anything, the rating itself is just a guideline. And honestly, the only time I've been shocked by ESRB ratings is when they rated something teen when it probably should've been mature. Goldeneye comes to mind. Shooting people in the groin and watching them grab their crotch in pain, detonating an explosive behind them and watching them blast forward, roll over and grasp desperately at the air then die, shooting them in the chest and pink blood spatters appeared on their uniforms instead of red because of the oxidized blood in the lungs. And it's not illegal to buy a game rated mature if you're underage, but store policy may prevent them from selling it. Which leads me to believe that you're too young to afford these games and rely on your parents to buy them for you, then rant on the internet. So you're too young to play these games anyway.
I'm still rather surprised that I bought Soldier of Fortune 2 at 16 without any problems, and I got carded when I bought Apocalypse Now. Which again proves the point that ESRB ratings carry no weight if you're buying them yourself.