Honestly I don't remember any dead moment in Harvey Birdman, I remember loving the show exactly because of that, it was really consistently funny, not a dead moment.
I don't remember any particularly weak moment in Venture Bros either, though not always funny, its never boring like say ATHF can be(and usually is).
I remember liking the few Frisky Dingo episodes I watched, but not enough to make me want to watch the rest though.