Max Martini did another great job as Lockwood here tonight and I would say that it even borders on Emmy-worthy, although I doubt the Academy will give this show any recognition ever.
The episode was good, definitely one of the season's best, but I still think this show struggles to deliver that blowaway episode. There really has never been a Castle that has shocked me and really had me go "wow." Killing off the annoying Captain did not do it for me, although that was a welcome event.
The show is coming back and while I expect Castle and Beckett to get closer next season, I don't expect them to start a relationship now, or possibly ever. Nice little moment with them after the shot I guess though.