TL;DR: Tactical strategy in a postapocalyptic world. Count me in!
I enjoyed Jagged Alliance and 7,62 (with the obligatory Blue Sun Mod), as well as all the S.T.A.L.K.E.R.s, Fallouts, etc. So this looked like a good marriage of concepts to me right off the bat. Add to this the unpretentious Russian storytelling, avoiding worn out game clichés and the main character being a cynical bearded man with cool comments and the game turns out really enjoyable. I finished it in just under 50 hours, which was a bit disappointing, as I enjoyed some epic battles there, and the story had potential to expand further...
The atmosphere is overall a bit postapoc-gloomy, but not depressing, just well fitting a random NPC's comment "Why is this country so f**ked up?" and the music unobtrusively complements it, although one "heavy metal" battle track can begin to grate on you a bit. Your character walks around with a leisurely pace (you can speed up, slow down or pause time anytime you like, if the action is too slow or too fast for you), exploring, scavenging anything useful, fighting bandits, looters, corrupt cops, hostile army troops, blowing up stuff, doing quests and following the main story plot as it unfolds.
The combat element is quite good, reminiscent of that in 7,62, with the game pausing when enemies are spotted or heard (or whichever way you setup your pausing preferences) or anytime you press SPACE, each action taking a certain amount of time to complete and you nervously checking the timer, will your character reload in time to shoot the bad guy, before he shoots you. Your character's stats play an important role in combat, so make sure you tweak them to your playing style (invest accordingly whether you are gonna be a hidden sniper or a charging commando). Particularly important are hearing and seeing, as your enemies will do their best to flank you and sneak up on you and your life depends on detecting where they are at any given time. I was pleasantly surprised that the AI isn't stupid and does not just blindly advance towards you, but tries to use cover, gets on your flanks to shoot at you when you don't see him, investigates noises and your last known position, etc. Combat can also be quite difficult, particularly when you've got a a nearly empty clip and several enemies advancing on you as they aren't bad shots either. So for some more difficult battles, you will likely die a lot and frequent saving is recommended. But sucessfully winning a difficult battle by employing various tactical tricks and approaches is very satisfying and looting fallen enemies can be quite rewarding too, if a bit too micromanagerial.
The camera commands are a bit clunky, but once you get used to turning the view with your right mouse button, zooming in and out with the wheel and moving the view with WSAD (hold shift for faster camera movement), you'll have good spacial awareness and control of the battlefield. One of the more annoying things is that the camera can get stuck indoors when you wanna look outdoors, and you have to "walk" it out of a door or window. There are also some other bugs that occur, like some talk or menu text suddenly switching to Russian (when it was English just moments before), your custom assigned keys resetting each time you enter the setup menu and the occasional crash, but I've encountered nothing too frustrating or gamebreaking and could bring the game to a conclusion.
Overall, if you enjoy this sort of game, tactical fights, RPG elements and atmosphere and can overlook a few bugs, you probably won't be disappointed.