I just battled my way to the end of the single-player campaign in the awesome "Ghost Recon Advanced Warfighter". The music during the climactic boss-fight stands your hair on end (if you still have any)
It's famous for its shortcomings (widely-spaced checkpoints, no weapons exchanges or pick-up of grenades, health etc) but once you get used to it then it's one of the best FPS I've played. GRAW2 is next.
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