If the rest of the episodes live up to pilot, Mr Sunshine will be a big hit. It is a smart comedy with dialogue reminiscent of some of the episodes of "West Wing". Allison Janney & Matthew Perry play off each other well and though Matthew Perry's character seems a little like, "Chandler - the Later Years", it's still very funny.
As with most ensemble comedies, it will take a little time to learn the characters and their individual personalities. I think this show has the potential to be a big hit and it is in an appropriate spot in the line-up at the present time, following 3 other hit comedies. Let's hope the network doesn't move it around to other time spots, as sometimes happens, before it has time to create its audience.