I got the feeling that the writer likes them, actually.
He says that they
are sharp-witted NZ'ers who play
"dim-witted boobs." I'd have preceed that with sweet and naive and left off 'boobs."
And as their characters, they do come off as awkward and I agree that if Bret and Jemaine on the show ever achieve success it'd kind of ruin things.
(If the show continues, of course.)
I read it as complimentary.