I wouldn't have included Rocket Racoon on this list because well....is there anything more badass than Rocket Raccoon :D
I take issue with a few of those.
Namely Speedball. He was virtually invulnerable to all harm, he could fly hundreds of feet through the air, and he could launch off his kinetic energy spheres as projectiles. Hardly useless, and certainly way better than Penance, who only has any powers when he injures himself, and even then those powers are stupid.
Butterball is immune to all harm of any kind. In theory, he's probably immortal, and he isn't prevented from taking in new information at all, so with enough effort he could become an immortal, invulnerable super genius, with I dunno, a gun of some kind.
Most enjoyable list ive ever read
Keep in mind that a lot of the characters about which you complain are intentionally ridiculous as a well needed injection of humor.
The fact you do not differentiate the humor characters from the idiotic ones makes you appear to be humor deficient or incapable of recognizing a joke. You might want to revise this list to separate the humor characters out.