My friend says that Halo 2 is not a good game and it's really basic or something, what did he mean by that? I've heard the game is a standard fps and too basic but still sells a lot of games. Please explain more.

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I wanna see the Bioshock sales charts, but we need more time! Madden NFL 08 didn't sell as much this year as it did last year by far, why? Is it because last year it came out on the 22nd(a week later)? Or maybe because this year everybody is resting, waiting for Bioshock?