SiN

The Good
There is a lot to like about SiN. Though the color pallette used is more drab than Half-Life's, the background graphics are still pretty cool. Many of the places that the player must visit are based on real-world locations, which makes them a lot more interesting than some of the nonsensical stuff we're used to seeing in FPS games. Your enemies have good artificial intelligence, and not only are they generally tough to kill, but hitting them in certain areas of their bodies causes varying degrees of damage. The whole "mission objectives" thing also adds to the game's appeal. Not a ton of people seem to play SiN online, but overall, the cool multiplayer levels and nicely paced action make for some good deathmatchin'.

The Bad
Unfortunately, the uninteresting environments in the game far outnumber the interesting ones. While you can interact with many things in the environment, this interaction is usually limited to breaking them, which isn't particularly interesting. The music in SiN can really get on your nerves after hearing the same annoying "tunes" one too many times. The game's sound effects, which don't sound anywhere near powerful enough, are even worse. After the first couple of levels were over, nothing about the game really drew me in, which is too bad. SiN is very long, but not terribly enjoyable.

The Bottom Line
Despite its flaws, SiN is definitely worth at least some of your time. It's no Half-Life, but it will keep you occupied for some time. The fun multiplayer mode only adds to the game's longevity. Just don't expect a real classic of Doom-like status.