In my opinion, I don't think Halo should have been rated M. The blood and gore isn't thrown in your face and language was mild at worst.
English
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I was actually going to say the same thing. :) Especially Halo 3. There's like no blood in that game at all. Halo: CE was kind of bloody, but yeah, not gory or anything like that. I agree with the language thing too.
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Dismembering the flood combat forms is what did it, I think.