I didn't like that crap show already from the 1st episode. The main reason was that this show depicts many short-timed stories instead of long lasting main story throughout the whole episode. All the jokes are just randomly played and they are not inter-connected.
And the jokes themselves are so lame that I can't find a perfect word to describe it. Word "foul" does not even stand close to the feeling I get. If I want to hear or see short jokes I just go on Youtube and watch bloopers, pranks, accidents etc - way funnier then what Robot Chicken offers.
This tv show is meant for people with redundant sense of humor that enjoy good old kick-in-ass jokes and are incapable of brain computing more complicated jokes.
Want to see some good old funny and deep meaning animation made in USA? One of 'em I'd recommend is King of the Hill. Robot Chicken - wouldn't recommend even to my worst enemy.