While this episode does have a number of tweaks from its source material, and I applaud the updates for their imagination, however it's just not as good as previous installments. Largely, I feel, that my lack of appreciation comes from how ubiquitous the source material is, how iconic it is. It's not that this is a perversion, but by name alone, it simply feels like a rehash of what we've all heard before. In other words, it's quite not different enough, and I'm not sure it could have been.

Creative update of the classic Sherlock Holmes story, though it's the weakest episode of the second season.

While Sherlock episodes are generally pretty good, this was one of my least favorite. Still, it's a great series, and even when it misses it is still really enjoyable. Freeman and Cumberbatch bring fresh life into the characters of Watson and Holmes, and I'd recommend the series to almost anyone.

The episode is entertaining enough, if you can live with the (needless) sci-fi upgrade, and the fact that you'll have this episode figured faster than Sherlock. ADVERT: I'm currently looking for a gas-mask like the one featured. Call 555-WTFWASTHAT.

By far the weakest of this Sherlock series. Does have good moments though. The acting is brilliant as expected.

Not on par with some of the better episodes, but hell, find me a show that is amazing every time out.

Heavily draws on the horror genre. Sherlock's monologue is outstanding.

One of the more difficult Sherlock stories to adapt with a modern twist. It was a fine attempt I guess but comes off as a bit goofy and contrived even with the increasingly comedic approach.

Highlight was the sieg-heiling monkey.

Not as poor as many make it out to be. It is still highly enjoyable, just not as strong as most other episodes.

Similarly to 'The Blind Banker' of Series 1, 'The Hounds of Baskerville' ironically fails to leave an impression despite deviating from the show's traditional formula. The drama feels like a footnote justification behind a mystery that also fails to give the viewer too much to chew on.

again, not one of my favourites, but i still rather enjoyed it - this episode not being one of my favourites is a testament to how fantastic the other episodes in this show are, because this is still very excellent television. i really like the way the episode dealt with fear, and especially enjoyed the character development on sherlock, as we get to see him unhinged for the first time. and as always there were some wonderfully fun moments. watson's freak-out jumps out as immediately hilarious.

A bit weaker than the others in the series, but still a solid entertaining mystery.

Most passwords require a number and/or a punctuation mark, for the record.

Nothing special. Moments of brilliance and humor, but the ending was disappointing. Poor use of CGI, overacting by everyone except our main characters and a weak story. Almost seems distant from the other episodes.

Very good,nice spin on the story.

This episode is solid, but not amazing. Once again the second episode of the season is the weakest. The main problem here is that isn't scary at all which seems to be the intent. It is however still fine entertainment.

Brilliant plot, definitely didnt see that one coming. Fantastic acting once again and the locations were awesome. One of the more funnier episodes of Sherlock, it really was quite a powerful episode, considering its subject matter and how it has been handled in the past.

They missed the mark a couple of times. To many deus-ex-machines to get the story going. The worst of the series, but still enjoyable.

The worst episode of the series by a very dramatic margin. Doesn't really work at any point. The CGI is godawful even for television. The depiction of Sherlock guessing that guy's password was sub-CSI stupid.

The first mediocre episode in this otherwise impeccable series. An episode that unfortunately is based on my favorite Sherlock Homes story, so I was quite a bit disappointed...

Soild, but stands out as the weakest of the Cumberbatch/Freeman "Sherlock" outings. That said there are some excellent horror-esq moments here.

Clearly an unpopular opinion but this is my favorite episode so far. It's horror-oriented and campy enough. The script isn't great but no episode has had a great script so far, regardless. The human side of Sherlock that they portray here feels more genuine than it did last episode, so that's good too.

Finally an episode I truly liked. I saw it for Russell Tovey but I liked the plot. It deviates from the book but I found that a good thing.

Again in keeping with the last season, this middle episode is a minor step down for the series. That being said, it's still perfectly performed and shot. As well as somewhat creepy this time around.