Naughty by Nature at Riverfest was ok. They kept playing these compilations of 90s songs (not just their own songs)...which is fine except that right as you would get into it they would change songs. They only actually completed about 3 or 4 full songs.
That's pretty text book stuff for these older hip hop acts that only have 2-3 songs that most people know. Their live show is mostly other people's stuff so the crowd stays into it.
Saw Vanilla Ice a few years ago. He played a song no one has ever heard to begin, he started whispering "go ninja go ninja go" as the song was fading out and the crowd got so pumped. He stopped and began another song no one in the world has heard, as it was ending he started whispering "ice ice baby" and the crowd went nuts again. He stopped, and then played another song 3 people have ever heard. It ended and then he actually played the ninja song and ice ice baby. But he drug out IIB out for about an hour, inviting all the young looking girls on stage and just ran around for that hour raging with the girls and dancing around. Such a bizarre 5 song/1 hour and 20 minute set, but so perfect.