-Main menu is confusing and weirdly set up, with useless animations for everything
-Music sounds way too dramatic and overdone for Black Mesa, like it was written for a sci-fi drama TV show. Also the more high-energy tracks are fucking garbage
-The tram announcer speaks in a fake overly robotic voice
-NPC dialog has too many unnecessary dramatic pauses
-NPC dialog tries way too hard to be quirky and funny, and just comes off as forced and cringe
-"""""""Eli Vance"""""""" is voiced by the same guy that does Barney and makes zero attempt at making his voice sound different
-Sound effects are bad, too mechanical and gritty
-Textures are not that great to look at
-Mod is an unoptimized mess
-Levels are way too dark
-Flashlight is way too dim
-Lighting is way too dim
-Too many extra areas that have little to no purpose other than to pad out the playtime and waste the player's time thinking it's worth exploring
-Forcing the player to rely on a guard to shoot zombies while rummaging through extraneous rooms for flares slows the pacing way down
-Flares are one of the worst combat mechanic types from Half-Life 2's episodes, and totally unnecessary. Just because it was a cut item from HL1 doesn't mean it should be added back. It was probably cut for a reason. Why the fuck would a bunch of flares be stored in dozens of underground science facility labs? Also they don't light up any of the environments via their emitted light
-Level designed in ways that cuts up the pacing, making it inconsistent, and overall slower
-Bullsquid projectile is not telegraphed properly, and has been buffed in a way that requires the player to take cover and peek instead of fight normally. Half-Life is not a cover shooter
-Houndeye attack is not telegraphed properly and buffed in a way that makes it almost impossible to avoid, especially because the sound is not the same as in HL1, and the attack happens much faster
-Too many physics props that get in the way and impede movement, exacerbated by Source engine physics jankiness
-"We've Got Hostiles" spikes the difficulty up instantly by introducing aimbot turrets both in the form of HECU and literal turrets
-turrets are literally just reskinned Combine turrets that had their accuracy buffed
-HECU are literally just reskinned Combine soldiers that had their accuracy buffed, also they constantly throw grenades that are basically invisible in the dim level environments
-grenades are thrown above the crosshair so they don't line up with perceived trajectory
-grenade's smoke particle effect when thrown is both hideous and doesn't improve its visibility