Who is the worst Avenger? Deathcry? Silverclaw? Gilgamesh? I liked Moonraker, so don't go there. Actually, it's probably Storm since she was there for two or three issues and didn't do anything. It's not her fault, but that seemed like a huge whiff to me. Likewise Mr. Fantastic and Sue. There's probably a difference between "Worst character who was an Avenger" and "Worst use of a character as an Avenger."