Everyone I've talked to says Jericho sucks, never found anyone that liked it.
Oh, I thought Jericho was a great game to play over the course of a week. A telekinetic sniper. A pyrokinetic with a minigun strapped to his arm. A katana-wielding assassin that can paralyze foes with her blood. A technopagan that can hack reality. A grizzled Catholic priest that can exercise demons and dual wields desert eagles (each of which can be loaded with normal, shrapnel, or explosive ammo). And you are the disembodied spirit that can leap from one body to the next at will. Everything about this rocks IMO. But it's far too short for anyone who shelled out $60 to feel anything less than disgruntled, especially with no online elements. Heck, it's the game I got 945 out of a 1000 achievement points on.
Other games I've played on Xbox:
John Woo's Stranglehold--This FPS is the video game "sequel" to Hard-Boiled. It made for a fun rainy weekend game. Good graphics, cool "bullet time" abilities, detailed settings. Short, short gameplay, and online tacked-on as an afterthought.
Saints Row I & II--I loved these games better than GTAIV. Tons of things to do wherever you go. Wildly over-the-top sociopathic fun. Not for kiddies. SR2's campaign can played in full co-op.
Army of Two--The whole game is meant to be played in co-op with a buddy. I found it to be way too short to get much gameplay out of, not to mention buggy and full of instant-defeat situations. Not recommended.
Mercenaries 2--Fun open-world action game with lots of undelivered promise. You can actually buy things like tanks and blackhawk choppers and have them delivered to you in the field by choppers. Sounds cool, but since everyone and his brother has an RPG that can blow these up in one or two shots, it quickly becomes a pointless waste. Being able to play through the whole mess with a friend is the only thing that makes it above mediocre.
Crackdown--This si the game that Army of Two and Mercs 2 wished they were. A wonderful Xbox-exclusive title.
GTAIV--I thought this was a big disappointment. Not bad, mind you, but with all the "game of the year", I really didn't see what the big deal was. I finished it within two weeks. Just not much content. The online is lauded heavily, but that's just not my thing.
Bioshock, Assassin's Creed, Fallout 3--All games that I played for a while and then just lost my enthusiam to pick back up once I hit a bog. I really want to get to them one of these days, maybe during the relative vacum between now and the 2009 holidays.
Civilization Revolution--This si to Civ games what 4e is to D&D. Some say it's "dumbed-down", while others say "streamlined". I thought it was fun for a while, but the AI's for the various countries are all too similar and too hostile. You really shouldn't try to encounter them, since diplomacy simply isn't an option. They'll immediately start making unreasonable demands for money and technology and declaring the instant you say "no", with zero regard for considerations of military superiority. And then they keep attacking to the point where their entire civilization has abandoned science, economics, or any other goal besides impelling endless waves of troops against your cities. I thought was funny for a while, as its a suicidal strategy that invariably ensured my victory, but it did get stale.
Oblivion--I played as a rogue-type character, and found the thieves' guild missions to be a real thrill. NPC's actually follow routines, and you get missions that entail stalking them, learning their behavior, breaking into their houses while they're out. Cool stuff. Unfortunately, once those missions are done, much of the rest of the game was unplayable for my combat-inept rogue. If I play again, I think I'll just do what I clearly ought to have done: play a heavily-armored mage.
Mass Effect--Lots has been said about ME already. Can't really add to it.
Orange Box--What a great little package. Half-Life I & II, Team Fortress 2, and Portal. All awesome.
Left 4 Dead--Best teamwork-oriented game I've played.
Culdacept Saga--A very good game with serious niche appeal. An addicitve combination of CCG and board game.
Far Cry 2--I got halfway through and felt like I got everything it had to offer. Like Ubisoft's other big game, Assassin's Creed, it's got a wierd design that punishes the player for trying to roam.