Uh...I watched the whole boring ten minutes and I didn't here him shit on any Star Wars films a single time. Just sounds like regular "Oh look how humble I am" actor jargon.
I think he's disappointed in the unrealized potential of the character dynamic between Luke, Leia and Han. Absolutely there should have been more involvement there instead of just all of them wandering off and being sort of tangential cameos for the new movies.
Those of us who saw the original movies would have appreciated a little more closure on those characters even if they had all died saving Chewbacca from some sort of space mange or whatever.
It had everything to do with drawing out nostalgia and suspense until the next movie. Also to keep people in suspense about Rey's identity in relation to Luke. Also they probably needed the extra time to get Hamill to emote when not in voice actor mode or were worried he'd be a distraction.
Clickbait garbage made by people who desperately want their obsessive hatred of Star Wars to be validated by someone inside the SW family itself so they can, um....win a facebook comment threat argument or something.
Hamill has admitted he has issues with a few things in Star Wars, but he has never "shit on star wars"