Though the core events may not be anything new for the MCU, particularly in so far as its origin stories go (Stephen Strange's A-to-B is virtually identical to Tony Stark's in the first Iron Man film) the psychedelic filter through which we experience these events is entirely fresh!
Not all of the humour lands, and in fact sometimes actually detracts from the story. While the effects are very impressive from a conceptual angle, the graphical end-products do sometimes fall short. Benedict Cumberbatch is a fantastic actor, and does a fine job as Doctor Strange, virtually the whole cast are proven actors, but none are really given the chance to flex those acting muscles to any sort of a newly impressive degree.
Those minor nitpicks aside, Doctor Strange is another very successful entry to the MCU, just further proving that Marvel really know what they're doing in this latest form the film industry has taken.
Final rating:★★★½ - I strongly recommend you make the time.