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Why are the min fps so low on my 3870????
Because the game is badly coded...
Wouldn't worry too much, imo. This game has had too much hype, and certain people will argue that its "The best game ever" till they're blue in the face, and make excuses for how it runs.
If its ok when you play it, then play it. Maybe turn the AA down. I finished the game before xmas, and I think one run through of Crysis is enough for me... Certainly wont be playing it "when the hardware has caught up". Just badly optimised.
Can you notice the difference with 8AA vs 4AA vs 2AA? I know thats quite low res so it probably shows up more.
TBH I find playing any FPS game single player more than once hard no matter the time between playing, you already know what gonna happen next no matter how open ended a game claims to be.