We live in an age of call of duty. Creating a tense and scary FPS game requires a lot of care and the balls to actually design a game where you dont need to pull the trigger every 4 seconds.
That's the thing though, the xenomorph isn't scary. The Alien pretty much got relegated to garbage fodder when Cameron made Aliens. Fincher's work with Alien 3 was probably the only way the series could continue, but people were up in arms about that.
There is no way to make an Aliens game that will work like the first movie. It just can't realistically happen. You can see this by the first encounter with the xenomorph in A:CM. Trapped in a small room with it skulking around in vents, and you're pretty much playing wack-a-mole. You can't uniquely replicate Aliens without being generic, since that's pretty much the definition of the movie. Alien 3 can't work without being modern because all we do in games is shoot people. What I've played so far, and I've played very little, is about as close to a good Aliens game we can get, ever.
A:CM is a blend of the three movies that are distinct from one another and practically in different genres (although there is a blurring of the lines).
Like, I don't think you can fault this game for being a bad Aliens game but rather that the franchise lends itself to being bad at continuing.
I'm going to bring RE4 again because it makes sense to me. RE4's revolutionary change to the franchise wasn't just about a camera perspective, it was about how incredibly different the way you engaged your enemies was to prior entries. That's what A:CM is doing, for better or worse. You can't just get this horror game with a xenomorph because it simply won't work. You can't just get an Aliens game because it'd be DOOM 3. You can't just get Alien 3 without being COD-like. You can blend them for fan service, or you can alter the franchise itself (which is what should have been done), providing a canonical spin on Humans vs Aliens.
From everything I've read, they lose sight of what they were doing right and end up doing everything wrong without thinking about what any of it means. Alas,
videogames.