Then don't buy it and ignore it
I don't like every movie, yet I don't complain about them.
My problem with Manhunt is that:
a) It degrades the industry by bringing negative media attention
b) It actually gets attention and sales despite being a very poor game.
Games should not make money when they are terrible because it sends the wrong message to devs. This point needs to be made. NOBODY should buy the game. Anyone who buys it just wants it for the violence because it is not a good game in the slightest.
25 years ago the kind of violence we are exposed to today would be considered shocking! It is a fact that we are slowly being desensitized to violence on all levels, and this is not a good thing.
I think people on the internet actually do to a point overlook the effects on kids. Everyone gets so caught up with arguing with idiots like Jack Thompson that insist that anyone who plays a violent game turns into serial killers that they don't consider ANY of the argument.
Personally, when I was little, I would think about videogames alot and be a bit creative. I would draw out my own stages and level designs on paper and all kinds of stuff. I'd come up with all kinds of variations on games I played in my head. (I'm talking very young here)
I think I still have some of my old drawing books
I played games like Sonic, Mario, and Kirby- in fact, I was a HUGE Sonic fanboy.
I shudder to think of the kinds of stuff I would have been drawing if I had been playing GTA or something like that.
I really do believe that kids are desensitized by violence at a young age. They should be kept away from M rated games and R rated movies because they dwell on those kinds of things.
A MATURE ADULT knows the difference. A child does not. The key is not to ban M rated games though- the key is simply for parents to not give them to the kids. People like Jack Thompson take completely the wrong approach.
You want proof? Check out any young kid (11-12 years old?) that plays Halo a lot, especially online. They are usually foul-mouthed trash-talking snots...
http://www.youtube.com/watch?v=LWnyUtdcboc&search=chocolate milk