XIII on the Xbox contains online multiplayer as well as a four-player split-screen mode and the ability to play against bots, though the bots don't really put up much of a fight. The game contains deathmatch, team deathmatch, capture the flag, and sabotage, which is a class-based team game that has one team defending a series of checkpoints while the other is charged with blowing them up. The back of the box claims that sabotage is an Xbox-exclusive mode, but the same mode also appears in the PC version of the game. The multiplayer certainly works, but the maps, most of which come from the single-player campaign, aren't very exciting. Also, an abundance of health and armor on many maps, combined with a general lack of punch from the weapons and the fact that you can have only six players per game, dulls the excitement.
XIII is a cel-shaded game, which effectively plays off of its comic book roots, but it certainly looks less than impressive. The models and environments are really quite basic, and the animation, particularly the facial animations for the speaking characters, is bad. The game's style covers up some of its shortcomings, but the problems stick out enough to mar the experience.
David Duchovny, Adam West, and Eve all lend their voices to the game. Adam West and Eve do reasonably well, but Duchovny, who plays XIII himself, doesn't come off sounding terribly natural. Beyond that, the sound effects and music are par for the course. The gunfire and explosions are satisfying without excelling, and the music fits the action pretty well.
The game has all the elements that you'd expect a first-person shooter to have. It just doesn't combine them in an exciting way.
XIII has a unique and potentially interesting premise, and some will certainly want to drag their way through the single-player campaign just to watch the story unfold, but the game doesn't really differentiate itself from the wide array of other first-person shooters on the market. The cel-shaded graphical style works in the context of trying to re-create a comic book, but the models and other graphical elements fall short. Given the large amount of competition in this genre, fans of first-person shooting are advised to spend their time elsewhere.