Crytek is now holding a massive Steam sale for the entire Crysis franchise. If you've yet to play the game, now might be a very good chance to start.
First off, you can buy each Crysis game piecemeal for a fraction of the price. Crysis 1 and Crysis Warhead are priced at $4.99 each, or you can do the sensible thing and buy the entire collection (including Crysis 2) for only $19.99! Keep in mind that Crysis 2 can also be bought separately but will cost you $9.99.
While the early Crysis games were mostly known for pushing PCs to their technical limits, the franchise is also known to offer a different take on the "military FPS" sub-genre. Yes, you're a solider, but you're not some Joe Schmoe who's given a gun! No, you're a war machine that's given a Nanosuit to do amazing feats and even be like the Predator and turn invisible!
Also, playing Crysis 2's multiplayer and seeing the "perks" as Nanosuit modules gives the game more traction on why its soldiers can do what they do. Heck, I just love hearing that "Maximum Armor" line over and over when I was playing it.
For those interested in the sale, you can check it out here. Be fast, though, as the sale will only last until September 10!
Crysis 3, the next entry in the franchise, is set to be released early next year for the PC, Xbox 360 and PS3.