Except for the 3 last minutes, you couldn't tell it wasn't a regular episode. It is rather disappointing when you realize this is the series finale. It should have gone out with a bigger bang.
At the end, when everyone was at the bar, I wish Calleigh was there with them too. It feels like a missed opportunity.
I didn't care about Samantha and plots related to her, we've known her for 10 episodes, we had no attachment to her. Every plot fell flat, even the teary hospital scene.
So yeah, a disappointing finale for a show I once liked a lot.