I am nowhere near beating the game and, apparently, not halfway through it, by RPS's account, but the RPS review seems much more in line with my experience so far than a lot of the other early reviews.
It's a game about exploration and environmental storytelling that also has very good logs and emails that make more narrative sense than most. It's not like everybody decided to record their last moments on, erm, the space station via audio log; a lot of the final recordings are surprisingly banal, even if they point towards new areas or missions. The attention to detail is pretty wonderful; one of the achievements is to find every person -or, in most cases, their corpse - on the station. Every corpse you find contributes to that achievement since there are no random dead people; they're all named and there's information to find about most of them, although not necessarily where their corpses ended up. The game really rewards taking it slowly and paying attention to everything, from the environment, to the data logs, to stuff written on white boards.
Yes, the mimics are annoying, but no more than headcrabs were in HL and HL2. Prey gives you very good tools to deal with every enemy, but RPS, and other reviewers, seem to revert to smacking the mimics with the wrench when you're clearly supposed to freeze them with a different weapon and then finish them off with the wrench. Once you get the rhythm down, its' easy. They're tougher to deal with when coupled with much stronger baddies, but nothing any seasoned video game player can't deal with.
Combat is mostly about picking the right tools or laying the right traps, at least early on. I've encountered a couple of heavy-hitting enemies I just had to overpower with weapons when I've gone off to explore areas off the main path, but I think I was essentially underleveled for those encounters and that they would have been much less resource-intensive if I had waited and explored those areas later on.
The level design and art direction are also fantastic. The whole station and every environment feels like a real place that had dozens of people working in it until recently. I haven't encountered an area or space that felt like an arbitrary video game space, if that makes sense.
Very minor non-story spoiler about a neat moment during exploration below.
Edit: Oh, and the music by Mick Gordon is really great sci-fi ambient electronica. The sound design overall is pretty good, too.