On the whole, I liked Doctor Strange, the movie. But I would have liked it a lot more if I had liked Dr. Strange, the person. He's pretty terrible, did you notice?
Let me preface this by saying I'm a comic book person, but I've never read a Doctor Strange comic so that factors into my opinions on the film and its main character. If that bothers you, maybe stop reading now instead of harping on me for not reading the comics. You shouldn't have to have read the comics to understand Marvel's films (or any adaptations for that matter).
[Some small spoilers to follow for Doctor Strange.]