Run and gun. Simple, effective, and fun!
There's lots of things that TimeSplitters does well. The design team came up with a concept to combine different themes of play into one game. This way you can play in the old days, modern days, or sci-fi-futuristic days. This varies the environments, enemies, and weapons. This also gives you some variety in the characters you play, and there are lots of models to pick from.
Lots of game-play modes are also available to select from. Story mode, arcade, death match, and other standard modes that FPS games generally have.
The controls are smooth, responsive, and easy to handle. The maps are also easy to manage and find your way around. A great feature with this game is that if you don't like the included maps, or play them to death, you can make your own with the built in map editor!
It will take some getting used to using, as I did not find the map editor very intuitive, and instructions scarce. The other down side to the game is the weak story. You know that you're in search of artifacts, but i never found out why, or who's trying to stop me, or if the time-lines are suppose to merge somehow. Of course, this wasn't much of a concern for me, as I was here for the action!
I started the review saying that this game did a lot of things well, which it does. It didn't create that compulsive addictive feeling like some other FPS games, but it's still a fun experience.