I'm not going to go as far as saying it's aged particularly well, but as far as on-screen depictions of Holmes and Watson go this is by far my favourite. Both of them are very likeable and their dynamic feels oddly refreshing when compared to most other takes on the characters, where either Watson is often buffoonishly stupid and useless or Sherlock is coldly unemotional, neither traits being very accurate to the source material. Here I actually believe they are friends, and it's that friendship which makes this show so entertaining despite its age and the poor quality of some of the mysteries.