Like the 80s hit series of Aliens movies? Well, you might like Aliens: Colonial Marines. It's set about four months after the events from the second film.
Weapons, plot, and characters are mostly from the movie series, with a few new xenomorph types. The game provides both traditional FPS elements of "Gauntlet Runs" and "Last Stands", which are essentially what they sound like they'd be, as well as fairly traditional multiplayer modes.
At the time of release, most critical reviews are negative, in large part thanks to bugs and bad AI (fixable with patches on the PC versions?) The few positive reviews praised plot and customization.