Hi Looking for a recommendation for a good FPS to be played on the Mac or quite happily under Bootcamp on Vista. I'm looking for a game that provides the best single-player 'campaign' experience as I won't be playing multi-player. I already have Brothers in Arms Hell's Highway which I enjoy very much. I have read a lot about COD4 but the consensus is the single player campaign is way too short?? Is it worth the current £18 for that? All opinions gratefully received.