Hmmmm. Colour me complex, but (Spoilers for Miss Match)**
I like the comedy potential of Serena dating Kate's dad. And I like Ryan O'Neal as a comedy actor - he's one of the people I'd like to see more of on the show. So far, it seems that he's used mostly to admonish or support Kate in turns, without much independent reason for being. I'm looking forward to this.** So all in all, I think this is good news.