The original trilogy has the weakest battles, but I can still appreciate them in the same way that I can appreciate battle scenes in Spartacus and Seven Samurai even though bigger and better battles have appeared on screen since then.
My two main issues with the prequel trilogy and the Disney trilogy are (1) the poor acting and (2) the "merchandizing". The dialogue is really really bad. The actors barely seem to comprehend the words they're saying. Some scenes in the prequel trilogy are Castle Shikigami 2 english translation bad. Dialogue gets better in the "new" trilogy comparatively but it's way too hammy and disconnected. Characters are primarily known by their catchphrase and mannerism. Every single line attempts to be the new "I have a bad feeling about this".
The merchandizing... Well just take a look at the glorious battles you've mentioned in the OP. Every scene displays a new droid, a new ship, a new soldier type showing up in well-paced 15-45 second intervals, like the steady rhythm of a song. And the characters casually banter while blowing it all up in lazy green-screen CGI. Consider the opening battle of Ep. 3 where Anakin and Obi Wan are battling in space. "Look master, Vulture Droids, now on sale at Target™ for $49.99" "YES! I see them, Anakin, and what better time for some Republic Clone Army Transport LEGO Cruiser™ to show up on DVD and Blu-Ray for $16.99 to explain the origin of this particular military unit". They yawn. R2D2 squeals and both jedi knights laugh as they crash into a ship and double-frontflip out of the cockpit. Rinse repeat.
Jar Jar is no worse than C3P0.... except the prequels included both and made C3P0 even more insufferable.