Story-wise I think ROTS is definitely the best PT films, visually however I think it’s the worst of the three.

Based purely on nostalgia I prefer TPM out of the three, but just practically speaking I think ROTS is the best of the PT over-all. It’ has the most solid story, fairly good good pacing, the acting (although a tad weird at times) is solid, and it feels like it actually matters. TPM and ATOC both feel like they’re just setting up a bigger story that we never really got to see (unless you count the Clone Wars series or the EU in general).

I’ve personally really warmed up to ROTS lately, and I even, dare I say it, think it’s a fairly good film just in general. AOTC is still a complete mess that’s hard for me to excuse even as a SW fan, though I still like the Obi-Wan scenes, and the first act is pretty solid for the most part. TPM’s biggest sin is just being kind of boring and telling a fairly unimportant story (it feels more like the plot of a SW tie-in novel). But I would say that it feels the most Star Wars-y of the three PT films, and visually I think it looks great. The practical effects are among some of the best I’ve seen (especially the miniatures), and the CG, though dated, is good for its time. That’s really my biggest gripe with ROTS, it looks really fake and the action is so over-the-top at times. Though when it calms down and focuses on the characters, I think it works pretty well. It’s a movie that I think suffers a lot from it not conforming to fan expectations.