I'm only 2 or 3 hours in, so I haven't reached this supposed point where everyone realises the game is too long, but I doubt it will take away from my view of the overall experience in the end. To say it's the best Alien game ever made isn't much of a compliment in fairness, but it is. I liked the films but am not a huge fan, though can see the dedication to the creation of the world and the atmosphere throughout this game, I can imagine it's like porn for fans. For years people have been saying that the way to create a decent Alien game is not to focus on the shooting aspect but to focus on the hunting and survival, as that's what makes it scary. I'm glad CA got the chance to implement this vision and am also surprised (in a good way) that it was a concept a publisher was willing to back as a mainstream, non-indie title.
It could do with a little more polish - the transitions from scripted movement to player-controlled can be a bit jarring, I didn't find the re-wire tutorial very useful (what are you actually supposed to do with the first one where you can activate the speaker system or an 'unstable system'?), whenever I get spotted by humans I just run away and they seem to forget I was ever there, and when you see the alien walking around on its hind legs it still looks a bit naff and less scary (though that's a fundamental problem with the creature design and its obviously better animated than in Colonial Marines). Overall though really enjoying it so far, the atmosphere has been nailed and it's definitely the most tense game I've played for a long time. Games don't normally scare me or provoke much reaction from me but the first time the Alien suddenly dropped down in front of me and ate my face I had such a violent reaction that the battery pad flipped out of my 360 controller.