As Jed [Whedon], Maurissa [Tancharoen], Jeff Bell and Jeph Loeb have said, many times, it was really exciting that the show got to end on its own terms, and that it got to guide itself into a landing, after seven years.
To me, I think they did a really great job, and I’m hoping fans think so, too.
I think they stuck the landing because I feel like there is the trademark intelligence, humor and heart, in spades, that you would expect from the finale.