These are just some things that bug me about them personally.
Too many start out with the boy farmer who fulfills prophecy or the guy with amnesia, or the guy that's looking for his father. They give you way too many choices. I don't care what color his eyebrows are. They start the character out too weak. He can only kill crickets or whatever. They give you a million things you absolutely don't need or want. They have ridiculous go-for missions, like find a teddy bear, that have nothing to do with the nearly non-existent plot. The fights last forever because of all the spell effects. You have to traipse around for miles to find something watching this compass needle.
I'll be the first to admit I don't play very many so I'm probably being unfair.