Why such a low rating?
I've seen the first 6 episodes and they aren't that bad. Granted, the pilot was pretty weak, but for example 'Hometown Hero' (episode 5 or 6) was pretty funny with Mantis trying to get his ex-fiance back while Po has to pretend to be an incompetent sidekick.
I think the humor rapidly improves as each episode goes by, it's as if writers of the show had to get used to the humor and not make it forced.