See, I don't like "Curb Your Enthusiasm" for the same reason I don't like the UK Office - none of the characters are remotely likeable. I get the "love'em because they're flawed" thing, but it just doesn't work for me.
The UK Office was designed as a limited series. They never even considered having to sustain those characters for 7 seasons, so they could all be hateful. But US television is just different.
Extras was cool though - it was fun seeing stars acting like you'd think they'd act in real life, but way over the top.