God I really hate bugs in mods. A good example would be Quarter Life. You probably haven't heard of it but let me give you some insight on this one:
1: Training Course
OK, so you start off by pushing crates and smashing boxes. Then you shoot some cardboard boxes and barrels. But the ... "fun" starts when you get in the tank. Once you get in and press the keypad to start the damn thing, the game flashes TEXT on the screen telling you that if you use ANY movement key, the game will crash on you, and I think that is bull! Not to mention that the sprites are all messed up. The textures are poorly made, things disappear, and the mapping needs SERIOUS work!
Oh yeah, and that was just the training course...
2: Actual game
Alright so you start out on a laggy truck that drops you off in front of what looks like a giant cinder block. Like I said, the mapping needs SERIOUS WORK! You go in with an MP5, a crowbar, and a pistol. and if the ammo for the MP5 runs out, that means you have nothing to defend yourself from Guards, and HEAVY DUTY MOUNTED MACHINE GUNS !!! Oh yeah and I forgot to mention, your killing all guards, scientists, and whatever else is living. Thats right no soldiers! Which SUCKS!! Soldiers are the best part of Half-Life! And after you get out of there, you have to go into tank that doesen't work...so yeah... Here you go: