(Los Angeles, CA) -- Fans of "Jeopardy!" seem to be pleased with guest host Mike Richards.  

He's the game show's executive producer, who found out he was hosting just three days before filming. So far, he's been praised on Twitter. One person said he's "A-plus" while another called him "perfectly pleasant."  

Richards will continue filling the shoes of the late Alex Trebek until March 5th.  

He'll be followed by Katie Couric, Dr. Oz and Aaron Rodgers.