Exciting, innovative and immerisive - Jericho is a first person shooter not to be missed by anyone. Great fun.
What immediately impressed my about the game were the graphics which are amazing. The lighting is very atmospheric and the character models are richly detailed. What also impressed me was the absence of any unskippable cut scenes in the game. The story is told while you're still controlling a character so if you get bored with what's going on you can still walk around (but you can't shoot anything, your weapon is lowered).
The game is full of innovations - there are no med packs to collect, you start the game with all weapons, you don't need to search for ammo because your weapons are automatically recharged - this means you don't have to conserve your ammo and can concentrate on killing the emeny.
The game is played with you as a member of a 6 squad team and for most of the game every member of the squad will fight along side you. You only die in the game when every member of the squad is dead and no one is left to revive you. During fierce firefights you'll find yourself fighting the enemy AND reviving fallen teammates - it's very exciting stuff and adds a whole new dimension to squad-based first person shooters.
SPOILER: Early in the game your character will die and become a spirit that can jump from one team member to another. This is an excellent game mechanic that allows you to control any other squad member and their weapons at any time in the game. It's a superb feature that works very well in the game.
Gamespot mentioned that the environments are too restricted for combat and you always die with exploding enemies - this is not the case. The environments are spacious enough for a 6 squad team and the exploding enemies are easily dealt with with the right strategy (yes, you will use strategy in this game).
This is probably the most exciting and intense first person shooter I've ever played (I've yet to play COD 4 or Crysis). It's a great leap forward for the genre and is full of wonderful ideas that I hope will be used in other games.