So far, I have seen all six episodes, and I cannot wait until they make more. To start off, Moffat and his group made excellent casting decisions on all of the characters because each of the actors adapted to their parts so well. Secondly, through critical analytical viewing, I have begun to see the different layers and branches between the characters and their relationships with each other. To touch only on Sherlock and Watson for now, in the very beginning Sherlock really didn't care about what Watson thought, though secretly he tried to impress him. That shows some of his little known vulnerability. Also, John was determined to be somewhat stand-offish towards Sherlock, but then because defensive of him once he spent some time around him, which reflects his soldier-like nature and the need to protect his "brother-in-arms", but later on it changes into him being something of a mother hen and Sherlock throwing tantrums like a child.
I for one love the way that the producers have brought this timeless classic into the present age and made Sherlock even more into a smart alec. If I could I'd give them ten stars. Two thumbs way up.
[-I believe in Sherlock; Moriarti was real-]