Renegade is one of my favorite songs.
Mr. Roboto is up there, too. One of my favorite songs to sing along to. Come Sail Away not as good as the other two, but still pretty good.
They have a number of songs I can't remember by name, but most of their songs are enjoyable if not fantastic. I downloaded their Greatest Hits album a few months ago, play it occasionally, otherwise I'd be more familiar with their work.
Genki Desu Ka seems unusual, but not terrible.