It is one of my favourite TV series so far. The British irony which characterizes it really fascinated me. Moreover, I think that Benedict Cumberbatch is the best Sherlock Holmes ever. Also the supporting characters are amazing: Watson, Moriarty, Mary, Magnussen, Mycroft, and so on. In particular, Sherlock and Watson's close friendship is one of the funniest in the TV history. The main feature which let me fall in love with this series is that every episode is better than the previous one. It always gets more interesting and more difficult (= funnier) for our detective. I really hope that the series hasn't reached the end yet and will continue for a 5th season.