[quote=Krein]
He's a huge threat simply because he's overpowered as shit. No surprise about his "accomplishments" there.
[/quote]

In my opinion there is no such thing as overpowered when you're a villain that lives in a universe with so many powerful heroes, by that logic all of DBZ's villains would be overpowered, and they are hugely loved by the fanbase. Again Superboy Prime was one the very few villains that made me nervous whenever he appeared because I knew people were going to die and get the shit beaten out of them. not being extremely complex doesn't make a failed villain, a villain's job is to challenge the hero and Superboy Prime does that amazingly well.