They say:
It is a 5 hour concept stretched for 15 hours.
The alien animation is strange and look artificial as it more glides than walk on the ground.
The story is garbage, there are zero personal stakes or interesting characters. You only open doors the whole game.
The alien doesn't scare anymore.
The gameplay consist of pointless minigames to open doors and stealth is only hide under desks and inside lockers.
The stealth sometimes is pretty random.
There are fake sounds to fool you to think the alien is nearby you on some vent somewhere but you quickly learn the difference between the fake vent sounds and the true alien sounds.
You feel more nostalgia than actually enjoy it as a stealth game and it doesn't work as a horror game. The tension is more a byproduct of you losing progress for a random alien attack than real challenge.