I recently watched a few episodes of Playful Kiss and found it quite funny, more like a sitcom than a TV series actually.
Although I am not a fan of Kim Hyun Joong [I liked Hua Ze Lei better than Ji Hoo, sorry], I actually enjoyed watching this for the fluff and, you know, the cute and funny stuff. Also, Jung So Min is so endearingly cute and krung krung [no, I'm not looking at you, Sandara] as Oh Ha Ni even if she has major self-esteem issues. Like, you know, clinging forever to KHJ's Baek Seung Jo even when he keeps putting her down. Just don't take this drama seriously or you will end up foaming at the mouth. I don't think it is meant to be taken seriously anyway.
If you want to know more about this K-drama without actually watching it, and you don't mind spoilers, then head on over to Dramabeans for their recaps.