Put about 4 hours into it yesterday. Had a couple freezes that forced me to quit out but otherwise it ran ok, even on my 8 year old rig.
Its basically a less interesting Bioshock with a different setting. I suppose it sits more firmly in the Bioshock Infinite camp of Columbia than it does Rapture when looking at it. You have an axe that acts like the wrench and guns that you don't get piles of ammo for which I guess is more like Rapture. I also have the left hand of power which starts out with a electric power almost exactly like Bioshock. So far I've fought pretty much one enemy and a variant of the same enemy. They're a little spongy and the first person melee is about as frustrating as it usually is in these games. You can upgrade your weapons and such in a similar manner to Bioshock as well. Though that upgrade machine you may have heard of already is a trying experience. Thankfully once I got a little further in it seemed to change and stop doing the thing. I won't spoil it.
The one thing I do like a lot is how you can hold the button down to pick items up and just walk around a room and vacuum stuff up which makes grabbing the large amounts of materials quick and painless. Unlike Bioshock, you use a myriad of different materials to craft upgrades as well as new weapons. You have to find blueprints in order to craft certain things, which are shown on a map only when your at a crafting station.
Alongside these crafting stations are usually a save point. The game has auto save and manual saves can only be done at these machines. Its not too frustrating since you can zip back pretty quickly and it sort of feels like a penalty for save scumming.
So far I'm getting that type of fix. I played through all the Bioshock's again last year and have been craving more of that since. I don't expect to be blown away by anything in this game but it'll be a fun enough one of these. If your also in the mood for one of these I'd give it a shot. I might suggest not going with the english voices as they are not only weirdly not russian but also not great to listen to.
Edit: I also put a couple hours into the System Shock demo on Steam the other day. Never played the original. Its pretty cool.