Okay yeah the story is dogshit in Dark Descent. XD That ending...Oof...But it is a good GAME, in regards to game-related stuff.Fireteam is pretty much a generic tactical shooter with an Alien theme. It's basically a new Alien Swarm (unrelated to Alien), and you could swap out the recognizable Alien aesthetics for, say, Starship Troopers' MI and Bugs and there wouldn't be a lick of difference.
Dark Descent? Jesus Christ, while they got the creepy, horror/suspenseful atmosphere right, the story itself is complete dog shit. It ranks as bad as Alien: Covenant on the "what the fuck is this?" scale.
I like how in both games Praetorians show up a fair amount, they don't get enough love in Aliens fiction.