Avengers
Best: Kurt Busiek
Worst: Jason Aaron
Iron Man
Best: David Michelinie / Bob Layton
Worst: Teen Tony/Hero Reborn from the 90s
Spider-Man
Best: Rodger Stern/Dan Slott/Stan Lee-Steve Ditko-John Romita
Worst: Denny O'Neil/The Clone Saga
Hulk
Best: PAD/ Al Ewing (Despite my misgivings about PAD as a writer he made so much of what the Hulk is today)
Worst: Donny Cates