The first episode was really good, but the others get less and less interesting. I suggest you to watch just the first two episodes.
I liked how Moffat stayed close to the original in the first episode and even the changes are nice. The second episode could be better, if he had decided to not create another copy of Sherlock and doctor who. He uses always the same narrative strategy with time jump and it gets boring. His characters sometimes understand things in an unrealistic way, while sometimes are just dumb.
I didn't like how moffat developed the story. He is good at creating a one time episode, but his narrative arcs are always disappointing