My big analysis: It leaned in on all of the problems with the series, but executed them really well.
As a result it’s exceptionally well done for what it is but never as good as “Sherlock” at its best. Better than “The Blind Banker”, “The Empty Hearse”, and “The Six Thatchers”. Worse than everything else. People compared it to “The Reichenbach Fall”. No way. “The Reichenbach Fall” was superior in every way, as it is to most things.
It was okay, but after the great return to form with “The Lying Detective” I was a bit disappointed.
I’d be unhappy with this as a finale. Here’s hoping season five is actually about Sherlock and John solving cases.