There, I said it.
Yes, "Star Wars" was (or at least the first three films in the series were) entertaining. But it's a simple story using lots of neat-o special effects. That's fine and all, but let's not confuse him with an artist.
Most of the acting in the films is mediocre at best (to be charitable), and the series peaked with the second film....which was in 1980. And Lucas didn't even direct that one. He only directed the first one and the current putrid trilogy that inflicted Jar Jar Binks on the world.
Let's be honest--all the subsequent installments for the last 25 years have merely been coasting on the massive wave of goodwill of the now 30- and 40-somethings who grew up buying R2D2 toys because of the original film.
To put it another way, Lucas is a one-hit wonder who simply had a knack for stretching his one hit for about 12 hours worth of celluloid. And only four hours of that have been really good. He's got one genre, and one basic story. Yes, he's an absolute pioneer when it comes to the technical side of movie-making, and we should give him his due for that alongside the guy who invented the steadycam and whoever came up with digital editing.
But Spielberg or Coppola he ain't.