The Luigi to Superman's Mario. He's fine, I guess. I like his powers and relationships, but I'm not a fan of how repetitive his stories are. Whenever you read a story about Superboy, you can expect it to be a coming-of-age story, a story about Conner finding himself or a story about Conner overcoming other people's expectations of him.
Even Young Justice was guilty of this, and after a while, it became boring.