Well I haven't played the later Alien parts, he said there is nearly no feedback as to what constitutes a good hit or not. Especially in a level that's dark (Guess there is such a level?) He said there was no way to tell whether you even hit an enemy. Unless you used the bow.. and once the aliens appear that was my impression as well. You could empty an entire mag at them with no clear hit or damage feedback. Aiming at the head in high grass was also not really possible
From what I saw in the first 3 hours (including that completely terrible tower and I think something with aliens in high grass and that distortion device.) These sections were imo the worst of any game I ever played. If I could play the game without enemies.. I would It is extremely pretty. By far the prettiest game out there. But as a shooter.. I think it would not be worth to buy it just for that. He played on hardest difficulty by the way. Enemies definitely did not die from 1 hit.
And speaking of AI, the AI is not as bad as i thought it would be. In fact most of the time it handles your fucking up being stealthy extremely well and swift.. usually means reload.
Also .. Checkpoint saves (sometimes quite far apart).