I've always felt Han's arc ended at the end of Empire. After Empire he's just a useless caricature of himself - there's no point to his character anymore. Come to think of it, there's no point to Leia because of it. And Chewie's along for the ride. Not to mention that keeping Han alive makes Lando entirely pointless and even more redundant than he already is (I like the character, but that's how it is), and it robs Jedi entirely of any focus it otherwise might've (and should've) had. I feel that at that point the story needed to converge instead of partially repeating itself and splitting needlessly into several subplots, out of which only one was remotely interesting, even though it didn't make a lot of sense the way it was written.

Jedi could've easily blown Empire out of the water, but they managed to screw it up completely, is what I'm saying.