Not a bad ending, really. The S4 finale is still the show's perfect ending, as I expected it'd be, but this was still fine.
Some nice touches toward the end, like the callbacks to the S3 and 4 finales, Hank leaving his car at the airport, and the family flashback montage. I'm okay with the happy ending too, even though I think it's way too unearned at this point -- and the show even made a frequent point of this, not just in this episode but throughout the last several weeks.
Overall the last 3 years were terribad and S4's ending still stands as the perfect series finale, but I'm okay with this as the closer. Still heads and shoulders above whatever Dexter shat out at the end.