Yeah, I recall TPM being well received at the time.
AOTC probably colored fans' opinions of TPM in the same way BATMAN AND ROBIN had fans re-assessing BATMAN FOREVER (which was quite popular when it came out).
I recently re-watched the PT and enjoyed all of them. In fact, I think they get progressively better. ROTS is as good as anything in the franchise IMO. Lucas really knocked it out of the park with the final confrontation between Anakin and Obi-Wan. Would really liked to have seen what he would have done with Eps VII-IX.