SERIES PREMIERE: Could this be the attempt that finally revives the prime-time variety series? Only time and ratings will tell, but these Saturday Night Live alumni might be more likely than most to pull it off. The title stars are Maya Rudolph and Martin Short, the executive producer is Lorne Michaels, and Kenan Thompson is a regular supporting player. So the talent is here: What matters are the ideas, the variety, and the execution. But is it worth sampling? Absolutely.