What i've seen of Curb wasn't too funny. Then again, I'm not big on movies/shows that seem to be completely based around the main character goin around and embarrassing himself, which is pretty much every episode I've seen of this show.
Curb your Enthusiasm is fuckign amazing, although by the 6th season a lot of it is schtick like Jeff Garlin's Wife Suzy... he shit is tired and played out.