Saying that it is overrated and crap doesn't really say why you think it sucks. People like it because of it's playability and storyline. As well as easter eggs and glitches. (Plus the Master Chief just owns)
I can't argue with you if I don't know why you hate it.
Especially if Zro doesn't even say anything.
Playability: another generic shooter offering nothing really different and having the same control as like every other shooter ever.
Storyline: OH **** ALIENS
Easter eggs: A gun everybody knows about and a soccer ball.
Glitches: will never kick as much BUM-BUM as the black hole. Not even the flying tank.