Yeah, I feel you.
It's probably my personal feeling but I don't really see Uther as a bad character - everybody keeps telling us what terrible things he's done but I've never actually seen him being completely EVIL.
Um, Morgana. I don't know. Sure, the villains are very flat and I really have to agree with everything you've said. But on the other hand - I personally never quite liked any of the female characters in this show :P But yeah, you're definitely right.