The alien design in the Prequels is just better.
>you will never stick your lightsaber in yaddle's dark side cave
Yes they were, but mostly because they did a fuck ton of maquettes, and I do mean a fuck ton.
Lucas made all of the best sculptors work their ass off to come up with a ton of alien ideas. Out of all of those you're going to get more than a few winners.
Also, lets not forget that Dexter is just pretty much Lucas waddle slapped onto a lizard head.
>original Yoda speech: someone not completely fluent in English, places words wrong sometimes
>prequel Yoda speech: constantly talks like a retard, unable to say a single sentence right