RotS isn't perfect by any means (a lot of the early stuff with Grievous is a pile of who-cares, there's only one female character of note and she's basically an accessory to Anakin's plot arc, etc.) but it's pretty damn good, and I do tend to rank it above RotJ though that depends on my mood.
The fall of Anakin, watching a fundamentally good person make some really bad choices, is powerful stuff.
The first two movies can occasionally be overhated on out of disappointment but they aren't very good.
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