Really bad
Unfortunately, a lot of people think "retarded" and "funny" are the same thing. The guys who made this sad excuse of a movie think that, and believe that watching a bunch of idiotic fruit-headed beings walk around and do boring stuff is the funniest and most entertaining thing ever. Sadly, there are many who agree with them. As long as crap like this is worshiped as a masterpiece, more of the same will continue to be made.
And this guy before me compared this to Spongebob... I mean, really? Spongebob cartoons have creative stories and are actually funny. Do the people who made this actually watch their cartoon and laugh? That's hard for me to imagine.