I did enjoy the finale. Was pretty funny.
But the series has run its course.
Depending on what they do next season, I'll probably watch.
But it will get lower priority for my time.
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Thought when Kate went to work for the FBI, that might reboot the show, but nothing came of it, and they've burned that bridge.
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The season ender for last year's seaon was the FBI diversion,but it couldn't last because she and Castle wouldn't be able to work together like at the NYPD. The show works because of the chemistry and interaction between Kate and Castle in the first place. So far the engagement & frequent sexual adventures together hasn't hurt the show like it did other tv shows like Moonlighting with Cybil Shepard and Bruce Willis. Their first time together in the sack ruined the show and it was cancelled that year.