I'm an adult. Ewoks fail to appeal to me. So we have a whole army in a "war" that I'm supposed to be rooting for that doesn't appeal to me, and the storm troopers are dumber than shit. Han, Leia, and Lando are blander than all hell. So I'm not inspired to root for them. Fisher was on drugs or something, and lost her ability to act. Harrison is as bored as I am, and he wanted his character to die so he could be done with the mess.
Then there's the space battle. It was decent, I'm not going after that.
Vader as a villain has nothing more going for him... he's a puppy on a leash. The main villain we're supposed to be scared of I guess, is a cardboard cut-out. He's so remarkably cliche and predictable that all sense of menace gives way to a laughable quality about him. Someone I think on this forum called him a "used care salesman for the dark side", and that sums it up greatly.
So... there's an absence of a side to really root for. There's an absence of any villain that you can take seriously.
The only parts that I find myself liking are Fisher showing some skin, and some of the Vader VS Luke duel.
Though when he "flips out" on Vader for mentioning his sister, Luke swings his saber around like a dumbass with a baseball bat.
And then there's the whole half regurgitated Death Star scenario. Why did there have to be yet another Death Star as the main threat from the Empire? Talk about lazy.