They don't make 'em like this anymore. No, really. They don't.
This show isn't out-right hilarious like Seinfeld or It's Always Sunny in Philadelphia, but it's consistently funny. The jokes are continuous, the laughs per minute ratio is high and there's nothing but comedy.
It is not some cheap, soapy drama punctuated by one-liners (How I Met Your Mother), but lots of light-hearted comedy.
It's shallow by design, light-hearted and light-spirited. There's none of that cynicism of some comedies (you know which ones), no "awwww coupley crap from rom-coms, no deeper drama, nothing of that sort. The comedy is based on making you laugh, not awkward and discomforted.