While it certainly leaves open the possibility of further adventures, this episode serves as a fitting finale for one of the most ambitious and audacious TV shows ever made. Here, we finally get a good look at Sherlock's origins, which reveal his most dangerous and fascinating opponent yet. Very entertaining, and filled with big moments, reveals, and payoffs.

Sherlock Holmes: No longer about solving mysteries, but about walking over the title character's history again and again.

I'm aware many are frustrated about it. But I like the idea of watching how Sherlock became the legend he is. We have so many small and big things that explain why he is the way he is. I'm so involved with his character that I find it very emotional. His childhood scenes moved me. Cumberbatch is stunning here. Gatiss is great.

It is great and is probably the most ambitious piece of television made, which also works against it as it was kind of exhausting to sit through. The tempo is too high and it feels like the writers were throwing all the rest of their ideas in the mix. I assume this was the end, since it will be hard to top. It is a fitting final chapter to a great series.

I personally think this entire series went off the rails by this point. And while it's still real interesting, it just fails to be Sherlock Holmes anymore. It's good, but still manages to disappoint. Alas.

So fucking stupid. Imagine trying to figure out where to take the show and using the Ring and Saw franchise as inspiration.

The Final Problem will be polarizing to say the least. In keeping with the rest of series 4, it can come off as a little overwrought and silly. The villain doesn't appear with the emotional connections she should. The ending is finely tuned and raw enough to compete with the previous endings. Although if this is truly an end for the series, it probably should have played out in a more straightforward way.

Please be the final episode so I can stop being forced to watch these because of other people.

After the first three seasons the fourth season is a let down, but this is a fitting conclusion to the three episode arc. It's absolutely absurd and reliant on gimmicks, but at least it remains entertaining all the way through with twists and reveals and tense moments and a fun, if not quite well rounded, villain.

If you're gonna jump a shark, you can right as well do it in style! Where this season's first episode failed to merge the establish universe with the super-spy high-jinx narrative the show's been moving towards, this one actually made it work quite well. Plotwise it borrows heavily from both Skyfall and Spectre, but the amount of crazy shenanigans they throw at the screen at a regular pace throughout the well structured hour-and-a-half makes up for it.

Eerlily similar to Spectre in a lot of ways.

What a way to go. Worst episode of the entire show. They got tired of just copying Saw's style of editing and chose to be a Saw film altogether.

My theory on this episode is that they wanted to make it so bad that people wouldn't ask for any more episodes

?

Boring and incredibly stupid.

there's no denying that its high octane melodrama but i can't deny that i absolutely loved it.it reached a breaking point of over the top where it went beyond bad into giddy entertainment.That prob doesn't make sense but whatever.Sherlock sweats bullets over multiple moral dilemmas,trapped in a vicious game by a villain who repeatedly gleefully murders without human sentiment!Despite being over the top there's still tense moments, its thrilling to see how theyll proceed, & i liked the mad ending

I mean, it was entertaining but it seems to have thrown any sense of plausibility and a cohesive plot out the window and it has now morphed into something very different from the first season. This was like a mix of Skyfall, Saw and The Crystal Maze. What happened to this show?

BORING.