The police consult bad-boy author Rick Castle when a series of murders seems copied from the pages of his books. Castle is paired with straitlaced Det. Kate Beckett. The premise is familiar. The dynamic is familiar. Or maybe these seemed familiar because I'd seen all the punchlines in commercials and online. Any lasting interest will come from how well the writers flesh Castle out and how well Fillion plays him.
There isn't much to ground Castle in the pilot besides his oddly responsible daughter, and we don't see what's made her so level-headed. As a writer, I like to see fictional writers portrayed more or less accurately, but more often than you'd think, characters who are writers just go through the motions and don't otherwise show many writerly traits. (Recent examples include Bones's Temperance Brennan and NCIS's Timothy McGee/Thom E. Gemcity.) I mean, screenwriters are writers themselves. You'd think writer characters would be easiest for them to write. I hope Castle's screenwriters and Fillion make the most of this opportunity, and I hope people watch.