I recently finished Vivisector: Beast Within, the ukrainian shooter from that one Civvie video. It feels like a middle ground between Duke Nukem, Half-Life and Halo, and it turned out pretty good.
Out of the three it has the most in common with Half-Life. It has the same semi-linear style of level design, and around the same movement speed. The Halo influence can be seen in the size of the levels; you do occasionally get those big directionless nature settings, especially around the beginning, but some levels are genuinely interesting. For example, you have a cavern level in which you start off on the ground but fight your way up across scaffoldings and giant machinery, and the size of the level just helps the atmosphere. It's in the gameplay too; in that level you rely mostly on the sniper and gauss, and have to be slow and methodical, while on the train (the high point of the game), you have to run and gun a la the Build Engine games. All the settings drag on too long, but on the whole, the level design is solid.
The thing taken from Duke Nukem, which I can totally get behind, is that the levels have secrets with weapons you're not supposed to get yet. The weapons are the best thing about the game, both because they feel great, and because of how many of them there are. All the generic FPS weapons are there, but they all get a ''super'' variant later on. You get a pistol, and then you get an automatic pistol (which is way more useful than it seems). The splash damage weapons do too little damage to be useful, but the Howitzer and Plasma Cannon are just too fun to use. Getting to use these over-the-top guns in a game that's niether a 90's throwback or ''wacky'' magenta triple-A crap was a legit treat.
Like Civvie said, the double shotgun owns.
There's a gore system in which every bullet chips away at the enemy's flesh, exposing his skeleton, but what I found interesting is that you can also knock off an enemy's gun, after which he'll tryto melee you. It has no gameplay purpouse but it's a cool detail.
I skipped most of the cutscenes, but the ones I did watch definitely qualified for ''so bad it's good''. It tried to be like a philosophical action movie, pondering on the nature of evolution, what makes a human being, etc. but it came out hysterically stupid.
Overall, it's no Blood or Shadow Warrior, but it's fun. I'd recommend it for the handful of interesting levels, but if anything else, it's a good game to play while listening to an EMJ podcast.