The Good: More Crysis, better balancing of open environments and closed, more big aliens to kill
The Bad: Nothing really new, still requires a monster to run, story is still lacking
The original Crysis was a technical phenomenon with a lot of great elements that worked, and Warhead is the exact same game with a different setting. This is both good and bad, but more positives than anything. You play Psycho, one of the special forces soldiers who was sent in with the original game's Nomad. This is his story and what happened to him while separated from Nomad. While the core story of Crysis wasn't too interesting there is a better mix between the open world and corridors. The game still gives you the option to choose to approach each objective by sneaking, sniping, driving, or guns blazing.
The game has more of a variety of objectives such as a train ride, and killing the larger aliens which can be pretty fun. There aren't any new weapons, and everything is pretty much the same. If you're looking for Crysis 2.5 with this you're going to be disappointed. While the game plays exactly like the first there are more cinematic moments such as running from a giant alien, and towards the end the game gets really epic. There are more aliens involved this time around instead of just mostly KPA soldiers. I still would have liked to see different alien types, and maybe make the game a bit more scripted since the game is so short.
The game still looks the same with no graphical improvements at all. You still need an ultra powerful machine to run this on highest settings with DirectX10. Even my monster computer struggles to keep the FPS at a non-choppy rate during large firefights. The game is also more forgiving this time around as I only died maybe a dozen times during the whole campaign. The mass of enemies are easier to take on since the game seems to feel more balanced and the close quarters environments seem to be designed for this too.
While I wish there would have been new weapons, new enemies, and totally new locales it works with the game's story. Warhead will really make Crysis fans happy and add an extra 4-5 hours and give you more of a back story to what happened to the strange Psycho.