How often do engineers get to save the day in video games?
If you have a PS3 or an Xbox 360, you might want to consider playing Dead Space. It has a nice, creepy atmosphere (like the first Alien film), very smooth motion, and beautiful 1080p graphics. The hero of the game is an engineer, and the two antagonists are a computer systems specialist and an insane physician, who's a member of the "Church of Unitology" (which closely resembles Scientology). Yes, you do run around and kill a lot of scary things, but there are enough unique elements to make it stand out from other action/adventure games. It's a pleasure to play because so much attention was paid to details and making the game flow the way it should. The zero-gravity sequences (of which there are several) are a lot of fun. The PS3 has a free demo available for download, and I assume the Xbox 360 does, as well.
The linked Wikipedia article does contain spoilers.