I have been a keen first person shooter fan for a while. I have purchased numerous games, both cheap and expensive. I have found that price is not much of a guide to enjoyment or satisfaction. I took a chance on this even though it was expensive at the time. I do not regret it. The missions are great. Really involving and quite gripping at times. Once you work through these you can use Arcade mode to choose any mission and this is good fun too. The game has an excellent multiplayer on-line mode. The main downside to this is that it is both very good and very addictive! The only point to note is that you need a fairly fast machine to get the best out of the graphics. Mine was a high end machine in 2005 (AMD x2, Nvidia 7800 x2, 2 Gb RAM) and still coped but not at the highest quality. I downloaded the latest Nvidia driver for my graphics card and this made the game more able to run at higher definitions, a useful thing to do if you have never checked that you have the latest driver. Since I first wrote this review I have bought a newer machine in 2011 (Intel x 4, Nvidia 580, 8 Gb RAM, SSD) which makes this game even better as the highest settings can now be used. I would recommend this one to anyone who likes a good shoot em up, although that comment does not do justice to the detail and realism which is exceptionally high.