I actually feel the opposite. I think the barge sequence is decent, but it isn’t something that justifies watching the rest of the movie for me. I’m actually not a fan of the Rancor fight, so it ends up feeling like filler. The only reason I’d ever have to sit down and watch the whole movie, is just to see the throneroom scenes at the end. With Rogue One, there are scenes throughout that I enjoy. I enjoy pretty much the entirety of the Jedha sequence, for example.
The Jabba segment, some banter in the 2nd act along with the speeder bike scene and the Luke v Vader/Space Battle above Endor is why I see watching ROTJ to be a mostly enjoyable experience. Not saying that Rogue One didn’t good scenes in the first two acts though; just wish there were more. Admittedly, if I had cared about Jyn more this probably wouldn’t have mattered as much as my investment in her would have made those first two acts more enjoyable. Especially considering that she gets all of her characterization in these first two acts.