ROTS is my favorite of the six movies (I have not yet seen TFA, I am waiting for the Blu-ray).
But what did I not like (as not even my favorite movies are perfect)?
The single scene with Jar-Jar.
Too much focus on Padme and Anakin’s relationship (I don’t like when movies get bogged down in romance sideplots).
General Grievous was a bit cheesy.