I have now finished the game, campaign, DLC and 2 runs of the survivor mode. The parts of this review I edit will be in bold.

2 hard, 2 sp00ki and 2 long. -11/10-IGN

Seriously though, boys and girls, this is it. This is the alien game we have always wanted and so much more. You really need to play for yourself to REALLY know whether you'll like it or not, but here's my Pros/cons so far:

Pros:

-Atmosphere. It's tense, tight and always having you check your corners. This is how an Alien game should be made, you NEVER fell safe, and I for one sigh with pleasure when I see another survivor, friendly or not, because either way it's them or the Alien, and I'd prefer them.
There's a couple of jump scares, some effective and some not, but the game in whole isn't going for that "scary ♥♥♥♥ your pants" theme, it's more "edge of your seat extreme tense intensifies".

-The graphics. Are they amazing? No, but they are not bad, at all. They are pretty good, and the "70's" feel the devs were going for works and fits perfect in the world the dev team created. Film grain is set o max as a defult, but I prefer it without it on.
The further into the game I got, the more I liked the graphics and the better the seemed. The whole 70's Alien theme they were going for really is amazing, and they nailed it perfectly.

-Controls. They feel great, they are responsive and so far from what i've played, it's never felt as though i've died because of poor controls.
I've seen people complaining about the UI, but i honestly think it is fine, and the only reason I'd see them complaing about it would be if they were using a game pad. keyboard and mouse works nice with the menus.

-Optimization. I'm playing with everything on ULTRA and i'm getting a very easy 65+ fps.
Specs
Intel i3 duel core (with quad hyperthreading)
Radeon 7700 HD series (4gb VRAM)
8gb ram

Not a very powerful computer, and this game STILL runs great.

-The Alien- Ho-ly ♥♥♥♥. Looks amazing, sounds amazing, moves amazing, is amazing.

-Audio. Not much to say. Sounds really good, the original score reworked to fit the game sounds amazing, the ambiet sounds are great. Just all round good job.
There are times when the soundtrack is a little loud and you can't hear the alien, but it doesn't worry me since the soundtrack really is just that good.

-The story. i haven't finished it yet, but from what i've played so far it's pretty good, don't really want to give any spoilers.
Since I just finished and I still think it's pretty good the whole way through, although once you get the flamethower it sometimes makes you feel that you're a lot more powerful then you actually are. That can be a good or a bad thing, but it just seems like the game starts to forget what it's about.

-Content. There's a lot in here so far. Besides the main story which is apparently 15 hours long, there's the extremely difficult survival mode and for those who preordered theres the DLC's. It's nice. I like.

-The lighting. Yes, the lighting needs it's own point. The lighting is seriously gorgeous, and captures the nature of the game, dark and gritty, with flickering/swaying lights.

Cons:

-Bugs. Yes, there are bugs like always. Although i'm sure the will eventually be ironed you, there are some pretty stupid ones that you'd think they would notice before release. So far i've seen the transit trams take me to my destination, not let me out for a solid 5 seconds, even though the door is open. I've also seen a gun floating in the air. Nothing game breaking though.I found a couple of serious issues, such as constant crashes(to the desktop), more common when I go to load without actually dying(if I wanted to redo an objective in a different way) the game would just crash.

-The Alien. Hear me out. Although the alien is a sick ♥♥♥♥, eventually it does lose it's 'mojo' once you figure out it's basic routine. Hear sound/see movement, hide from it for a bit, it'll go away repeat, but don't let this fool you, the mother ♥♥♥♥♥♥ never stops you from sitting back in your chair.

-Now this, THIS is what really pissed me off. The ENDING(NO SPOILERS). ♥♥♥♥ you CA, ♥♥♥♥ you SEGA, ♥♥♥♥ you CA. Biggest sequal/DLC bait I have ever seen. It isn't AS big of a deal for me since I have the DLC pass, so if they DO decide to continue with the story in DLC, I guess i'll have access to it, but what about those who didn't have the money for the pass you ♥♥♥♥♥♥♥♥? It really pissed me off.

Just a couple of things about the game I see a lot of people complaing about:
-No, they Alien does NOT cheat. Besides the fact it can seeyou, hear you AND as far as I know SMELL you, the closer you are to the alien, the more likley you are to be caught.

-The Alien does seems to teleport to you at times (for instance you might hear it jump into a vent, you get out of your hiding spot then it randomly sees you). This might be an issue, but i honeslt y think there is a reason for that, and that reason is answered near the end of the game (I don't want to spoil it for those who haven't finished the game, so at the end of this review i'll put why I think this is after three lines of **).

-THE ALIEN CAN HEAR YOUR MOTION TRACKER.

-As far as i'm concerned the alien can also hear you getting in and out of vents/closets/cabnets.

-♥♥♥♥ the ending

If you have any questions, please feel free to ask in the comments.

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The fact that there is more than one alien on board could be the reason for this, although it still doesn't make that much sense, but it's just a thought.