The greatest Half-Life modification ever made. You can't play BooM... BOOM PLAYS YOU!
I'm aware this mod is meant for trolling. However, I think I can summarize it in a few words.
Menu music from a Russian hippie or new age guy named Gayduk, confusing mapping, absurd and unfunny enemy skins (when not stolen), even worse scientist skins, lazy and broken texturing, wrongly designed doors, unfitting pictures, unsynced sounds, annoying and never-ending Russian voice lines, incoherent story (yes, it seems there is one), monotonous enemies' spawn, broken AI pathfinding, flying ichthyosaurs, rendering issues due to massive enemy spawns, less than an hour of gameplay and after acquiring the longjump it becomes very easy, abrupt ending...
I can't seem to find anything of interest in Half-Life: BooM, even as a troll mod. This is getting a 2 only for the catchy main menu song, fast-paced gameplay and because the first time I played the game I found it "challenging".