Nice game, some nicely designed levels later on, both visually and in the layout. Timeshift is just a few rungs down from being a great game, mostly due to story and look. On the positive, the weapon design and engine is superb, and the scenario design is nicely balanced with larger firefights, corridor and some neat sections like the wind tunnel. Timeshift gets significantly better in almost every way as it progresses.
The only real damning element is the originality of the game. As they took Serious Sam and remade it into the not quite as good WillRock, Saber took Half Life 2 and FEAR and made it into the not as good Timeshift. I'd like to see Saber be more adventurous with their next game, and not borrow quite so shamelessly from existing titles.