The game has been enjoyable so far (I think I'm more than halfways through the game) and I'd say it's the second best Alien(s) game after Alien: Isolation. The concept of the mental states of your marines being pivotal to their performance is really well-made and adds a lot to the already tense game play, and in theory the expendable marines concept is a great addition as well. However, I wish that the marines were even weaker, especially against Alien attacks. It breaks the immersion when a Warrior lounges at you and it just takes away a bar of health, or two at tops. Also, Crushers and Queens are way too easy to kill once you set up a good sentry gun kill box perimeter - I almost wish that Sentry Gun fire did barely any damage against larger Aliens and that you'd need to use Mines, Grenades and ARC/APC attacks to kill them.
Other than that I'd say it's a solid game. It definitely reminds me a little bit of XCom, but the real-time mechanic, with the slow-down of time, works really well and kind of sets it apart from somewhat similar types of games.
Oh, and I also like that (so far) the powerloaders in the game are only used for carrying and placing objects that too large and heavy for humans ans synthetics to carry, i.e. no mecha boxing matches with Queen Aliens.