For me a multiplayer game is almost always, with a few exceptions, more hardcore than a single player game because playing against human opponents is infinitely more challenging than against AI. Just go to mlgpro.com if you want an idea of how deep and hardcore games like Halo are. When your competing for a $100,000 in a proffesional gaming circuit I guarantee you that the competition is more hard core than anything most of you have ever experienced.
Again there are a few exceptions with games like Ninja Gaiden but in general what I say is true.
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