I sat through a Star Wars marathon earlier this year, starting from Phantom Menace, through to ROTJ, and it was awful. By the time I got to the good stuff, everyone else was fatigued and sleeping. We had TFA, but I was the only one up by the end of ROTJ, and I was kind of sick of it all by then.
If I had to do it again, I’d just watch Star Wars and call it a day.