The entire Bravo Company from Sarge's Heroes. But two stand out more than any others.
Thick would stroll blindly into the scopes of six or seven snipers and suddenly the past hour and a half of gameplay is completely wasted. Secondly, he was retarded. Not using that as a derogatory term, I mean he was literally mentally retarded.
And Scorch? Scorch was a nutcase. I mean the guy spent as much time laughing to himself as he did talking. He also had this incredibly infuriating tendency to get as close as he could to an enemy before torching them, nevermind that they might be toting a grenade launcher.
Seriously, I mean they have an autistic machine gunner and a psychotic flamethrower. Does the green army have some sort of psyche evaluation or is it an open door policy? The worse part was, you had to protect these guys from getting killed by their own stupid mistakes.
Funnniest thing was, after Sarge's Heroes 2, the series went from Saturday Morning fun to Apocolypse Now.
Before
http://www.youtube.com/watch?v=ticZ2Q4LTo4
After
http://www.youtube.com/watch?v=1Revj1JumKc