As for Fett not doing much in Empire, the thing is that without him tracking down the Falcon to Cloud City, the last third of the movie wouldn't happen. In RotJ, if Fett didn't flirt with the dancer and fall into the Sarlacc, um, nothing would have changed. His death doesn't have to be a blaze of glory, but Lucas is just ruining our remembrance of better movies by killing him with one of the Three Stooges.
Here I am going off on a RotJ/PT tangent after getting yelled at about it just a few pages back...