Series 1 and 2 were pretty good. Cumberbatch was the key guy, but I really enjoyed Mrs Hudson and Lestrade. Watson just seemed to be superfluous and was clearly just meant to be thick which is a shame.

After that I watched it but lost interest. Cases went out the window and it just became a jumbled soap opera.

The basics of solving cases is the beauty of these things. Why Moffat is allowed to create drawn out complicated storylines that make you lose interest is beyond me.

The cases themselves weren't even overly taxing, but once they got away from them entirely I barely paid attention.

I would say watch 1 and 2, but it is not a series I would watch again. A real shame.