Elementary, starring Johnny Lee Miller as Holmes and Lucy Liu as Joan Watson. I started watching out of curiosity and I always enjoyed Johnny Miller and got hooked rather quickly. The series honors a certain amount of Sherlockian lore (know that there is still a very fervent base of Sherlock fans) yet presents a unique twist to the plot.
Probably the most interesting is the twist of female characters in the show. Besides Liu as an introspective Watson (Joan Watson is actually given a back story, coming to Holmes' house as a sober companion for his recovery), there was also an introduction of a female Moriarty (a weird double twist where the character of Irene Adler and Moriarty are actually the same person). One reason I like this Sherlock is the gender equality: women can be just as clever and conniving in Elementary.
I have many friends who enjoy Benedict Cumberbatch and more well-known Sherlock but I think Elementary has some serious merits and is worth a watch.