Mildly funny, watchable, but I can't understand the many rave reviews for this.
I'm guessing this is aimed at prime time Comedy market, so the characters are two dimensional, there's little to no subtlety, and there's nothing that means you have to pay attention. For all that it's still amusing, but really not great.
It's not as laugh out loud funny as much British comedy (Black Books, Father Ted, etc); Not as clever, and lacks the engaging characters or plot of House, West Wing etc. Something to distract you, but there's better out there.