I agree the 3 Lucas prequels have the best characters overall.
But I don't think you can completely dump on the sequel characters.
The characters in Rogue One - which is technically a prequel but isn't listed among the prequels and wasn't created by Lucas - has arguably some of the best characters.
Who is worse - Jar Jar or Rose? I didn't mind Rose - didn't love her, but wasn't annoyed by her like I was with Jar Jar.