Markku helpfully summarizes the Star Wars Saga:
The plot so far:The third one burned down, fell over, then sank into the swamp. But the fourth one will stay up! And that's the true lesson of Star Wars, kids, just keep building bigger and better Death Stars until one finally survives the arduous construction and beta testing process and you rule the galaxy.
-Empire builds a Death Star
-Empire builds a bigger Death Star
And now... Wait for it...
-Empire builds EVEN bigger Death Star
And the movie knows how silly this is. When the rebels hear, they basically go "Oh come on, not this shit again? *sigh* Ooooh-kay. Where's the shield generators? There. Where's the weak spot? There. Ok, guys, let's go blow this up.
Now, it's really nice that the movie is forthright about how much the central plot element sucks, but I wonder if the alternative occurred to anyone, to make it NOT suck and not have to apologize for it.
That's the real weakness of the movie.