We can never be mad at Family Guy creator Seth MacFarlane, for the good mostly outweighs his bad, but this one was a real headscratcher. It's not surprising that the suits would try and spin off a franchise as successful as Family Guy, but Cleveland of all characters, really? He was never funny!
His contribution to the series can be measured quite simply by this: Do you watch any episode post his departure and say, "This is kind of funny but, damn, where's Cleveland at?" Didn't think so. If his absence doesn't even register on his parent show, why give him his own series?
There is absolutely nothing new or innovative on The Cleveland Show that you can't get from Family Guy, and if it weren't for its lead-in audience it'd probably be cancelled by now.