XIII is fairly good shooter with a certain comic-book style, but it doesn't know how to convert it right into FPS.
Gameplay:
Interesting looking, you're given a variety of weapons (throwing sharp objects, regular pistols, SMG, assault rifles, miniguns and a crossbow and more) during the single player mission, the comicbook-look also will flash towards you when you kill somebody, like if you shoot somebody, you'll see about three pictures of closeups from the bullet piercing thru its head, its neat.
Graphics:
Top-notch for their time, and also enjoyable in 2007, the style in the game is a big part of its selling point, if you throw a grenade, a few seconds later after the explosion the words ''BANG'' will come up from the remains of the grenade, it has a certain touch, if you fire a bullet it'll also say ''POOF'' or something, if you hit somebody, you'll see bubbles saying ''NOOO!'' and '' DAMN!'' Cellshading did good in this game.
AI:
To good, even on default settings, the bots seem to hit you from any position, you'll die alot and fast in some missions, making it a frustation expierence.
Story:
You're this guy with amnesia, he wakes up at a beach and already gets a assault of terrorists behind his back, you kill them etc, and move on.
Main story line goes thru as you named as ''XIII'' trying to get his memory back, and no, he won't get it back by shooting down lots of people, he'll mainly go investigate places which may lead him to his destination, but lots of conflicts with terrorists will happen alot.
The level designs are good, some are pretty fascinating, like a level where you go thru shaft, and you look down the ventilation and see terrorists talking about how to kill you, its funny at times, but most levels are rather boring and overdone.
Sound:
Sound could be better, I'd love some cheeseball/psuedo music you'd expect from a game like this, but it gives you no music, only rattling of guns and people screaming names.
Multiplayer:
Theres a multiplayer, but everytime I get on it mostly two or three people are playing it, back in the days there were hundreds of servers, the game was interesting, there were CTF, DM and TDM and a TDM with shotguns only.
Is it a good FPS:
Kind of, its a hard game, but the style makes up for it, the game is cheap as dirt right now (few bucks or something) and is worth the 2 dollars it is now if you want to check it out, you can play the demo if you guys want, it has some action for you that'll might attract you.