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"Being rewarded for the simple act of playing the game through gained skill and knowledge, that is the ultimate meaning of being a gamer."
I agree if you understand what you can and can't do is expected to be challenged. But when a game isn't clear or really comes together after 1 playthrough like Viewtiful Joe, or the Wonderful 101. It's not that simple.
Edit: Aside from Left4Dead are there any other games with adaptable difficulty?