There has to be a happy middle ground between Lucas meticulously controling every detail of the film, and no involvement from Lucas at all, because we've experienced both, and it's shit.
That happy middle ground gave us ESB.
It's sad how we couldn't get back to that balance, of Lucas as the general mastermind but collaborating with people who could shape his vision into something stellar.
resorting to a second Death Star, in the same trilogy, is just slumming it. (He also claims Anakin blowing up that droid control station in PM is another echo of the Death star)..
The second Death Star never bothered me, it looked cool to see it under construction and flying around inside of it instead of on the surface was cool, it was different enough that it's acceptable.
The focus at the end of Jedi isn't the Death Star anyway but Luke's confrontation with Vader and the Emperor, the second Death Star was just for added flavor.
However the bigger Death Star in TFA was bullshit.
As for the Ewoks, yeah, I really wish it was Luca's original idea of Wookies, that would have been perfect, but it just wasn't feasible at the time technology wise to have so many Wookies onscreen at once, so I can forgive the Ewoks, they are pretty cute and they at least don't talk, unlike Jar Jar.
Plus the scene of C3PO telling them the story of their adventure is a great moment.
Jedi is the weakest of the original trilogy but it's not a bad movie at all, I've always had a soft spot for it.