I hate to sound like a reversed Mr. Plinket but the one scene that always bugs the hell out of me is the scene were instead of killing the Wampa and staying in the cave on hoth, Luke runs into the snowstorm like an idiot and almost gets himself killed.
Luke Skywalker is the main character and either Lucas,Kershner or Kasdan(also why does the spell checker put a red bar below Kershner and Kasdan, I even went on the internet to see how their names are spelled and I still get a red bar) made him look stupid.
I guess after the prequels and SE most people are gonna assume that it is Lucas fault.