Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Castle just gets better and better!

I recommend watching this series in order, starting at episode 1 in order t fully appreciate the giant story arcs, character development, and humor that builds on previous show scenarios. Castle is one of the best written and acted and directed series I have seen. It is a complete joy to watch. And for Firefly/Serenity fans, this show is a must since Nathan Fillion is basically acting his Mel character but on Earth, which is amazing to watch!This series continues to get better and better, and the end of season 4 finally delivers the completion to the biggest story arc in the entire series-- don't miss it!