Nathan Fillion is fabulous in Castle -- I don't usually go for series based on mysteries, but Castle is definitely one of my favorite things on the air in the last decade. It's got charm, strong female characters in three different generations, front-and-center characters of color, snappy one-liners and comebacks, a strong supporting cast... and Nathan Fillion! Did I mention Nathan Fillion? :D

(I have been so tempted to volunteer to do meta for Castle: I Don't Know Why I Love You, But I Do - Why Castle Is Winning Us Over -- the only thing stopping me is I don't consider myself "in" Castle fandom. But omg, I could go on at such length about why I love that show! I just wouldn't want to stop anyone else from doing the same, esp. if they're more in touch with the fandom itself. :D)