What I was talking about were certain things people tend to pick on. For example a lot of times people will say Lucas is "too reliant" on the latest special effects to the point of "showcasing" the effects as a priority.
You could say the same thing about the nifty new effects Lucas pumped into the classic trilogy back in the day.
Now if you want to say aside from that, that you personally feel the prequels lacked any substance beyond being a technical demo (not that you are saying this), that is a matter of preference, of artistic taste. The only thing I can say in return is that I happen to feel they had just as much substance as the stuff that held the classic trilogy's SFX together.
To me artistic preference is an opinion, not right or wrong.