Played about 2 hours on normal so far, enough to still be able to get a refund and an okay idea on what's in the game. Stuttering is a massive problem, any time it has to load an area or load in a new shader you are going to notice, usually 5-10 seconds. The framerate has been fine other than the stuttering (don't want to downplay that), if the game has nothing new to load in then it generally seems to run at 60. The first hour was the worst for the stuttering, the ship and the beginning of the prison you'll notice it every new area and cutscene. After Medical it hasn't been egregious but its still noticeable. No crashes at all.
Combats fine, instead of running around like Dead Space you can weave left or right and block. I don't know if its the case for all guns, but at least with the pistol you can get a quick shot in after doing a melee string. Smaller enemies go for longer combo strings it seems like, fat ones like to block, and ranged ones sit around spitting at you until you get close enough. Since the main focus is on melee enemies don't seem to solely dogpile you if there are multiple, the ranged guys will keep spitting at you during the encounter if that is the case though. I think there are 5 types of guns in the game, got a pistol and shotgun so far. You also get your telekinetic glove you can use to throw objects at enemies, it seems like most objects can do some form of damage. You can also lift small enemies and throw them for distance and some environmental kills, you can probably lift the bigger guys later. There's an upgrade tree for each weapon and your glove.
Level design has been linear, there was a second path in Medical that I didn't take so I don't know if it lead to a dead end or brings you to the same area. At most there have been small rooms attached to hallways, or a smaller office in a bigger room, not much in terms of looking around and exploring. There are audio tapes scattered about but it seems like you have to listen to them in the menu though which is baffling, and there are also schematics that can be lying around that you can miss because of a full inventory.
I'm leaning towards refund but I want to see if/how they handle the next few days since I am still enjoying it. If Dead space was a 9/10, this would be a 6-7 so far.