I don't think it's just the story that gets praised for the prequels, kind of the opposite, it's the prequels original ideas & expanding the SW universe that gives it credit today, ST tried way too hard to copy the OT, it worked for people's nostalgia in TFA, but by the time TLJ came out, people started to miss the creativity of the prequels.
Pod Racing & the CIS army are pretty fun, they fit amazing in video games, then you got lots of cool new planets on top of that & while the politics may have bored people, it was nice to see the senate we heard about, especially when Palpatine destroyed it. When it comes to the sequels, i can't think of many new ideas or cool designs, it seems even Klaud got his role cut in ROS because they realised he looks lame, i guess Knights of Ren & Phasma were pretty cool, but they get wasted hard, so it's difficult to bring them up without pointing out another flaw with the sequels.