Um. What a terrible finale. Sorry... but this was just not good. I know that this was a version of the episode that they had prepared in case they got cancelled. I was expecting a fully rounded ending. Instead, we got what I assume was the originally planned cliffhanger, with an insultingly brief epilogue tagged on to the end to wrap things up with a pretty bow. I'm not happy.
Cons:
This didn't feel like a finale in any measurable way. It barely felt like the end to a season, much less the end of a show that's been airing for eight seasons. I've made no secret of my distaste for the LokSat plot, and the wrap-up was no better than the buildup. In short: Castle gets kidnapped by LokSat's right hand man, and is given a truth serum that forces him to give up the identities of everybody else who knows the truth about LokSat. Beckett and Castle had just revealed the truth to Ryan, Espo, Alexis, and Martha, which means that these four are in danger along with Beckett, Vikram, and Haley. Luckily, Ryan and Espo save Castle from dying, and Beckett realizes that LokSat was actually Mason Wood, the guy Castle had met in LA, who headed the Great Detective's Society. Beckett and Castle defeat him, and all seems well. But then at the last second Caleb Brown, who they all thought was dead, shows up and shoots them both. Beckett manages to kill him, and then she and Castle seemingly succumb to their wounds, holding hands. Flash forward to seven years later, and they're both fine, and they have three kids.
Okay... where to even start with this? The big shocking reveals in this episode were utterly lackluster and nonsensical. If Mason Wood had been a character that we'd seen in more than one other episode, maybe the reveal that he was LokSat would have packed more of a punch. As it was, this reveal was even more of a disappointment than the final reveal of Red John from The Mentalist. And then the Caleb Brown fake-out... there was no attempt to explain why Caleb wanted to come after them after having faked his death. Was he supposed to be the real LokSat? And if so, why risk his life to take out Castle and Beckett, when they thought that they had already defeated LokSat? It made no sense, and it was a cheap way to cause a panic in the last two minutes.