Dr. Who is the best science fiction television show of all time - past, present, and future.
With his sharp mind, vast knowledge and experience, mind boggling technology, fearless sense of adventure, strong moral compass, and quick wit, he immediately sizes up a situation, explains everything to everyone, and takes appropriate action.
Cosmic scale and logic defying science are standard operating procedure. Story arcs, subplots, and reoccurring characters are maximized. Banter is snappy and cleaver. Drama is wrenchingly personal. Cast members fling themselves into their roles. Nearly every scene is bursting with entertainment. Creative quality is consistent. Many episodes, particularly the two parters, are Hollywood level. Several episodes have won Hugo and Nebula awards and nominations.
One aspect of “Dr. Who” that provides realistic depth is the faceoffs between the Doctor and other characters. The people he opposes and often even the people he helps express stern disapproval of his actions and/or justification for their own actions - and they usually make a compelling case. Dr. Who is a hero with plenty of the right attributes, but he also has plenty of dark secrets, deep fears, and forceful critics.
There's certainly never been anything like Dr. Who and there probably never will be.