I ended up disliking the movie quite a bit, which is not what I expected.
It just felt like the movie had no depth at all. There wasn't a lot of character development, the villain had no motivation (a Marvel staple, I know) and it felt like things just... happened. There really wasn't a good sense of time and progression, once it hit the second act.
I also expected the movie to be a lot more creative with its use of magic, but it basically came down to portals, shifting buildings, flying and magic ropes. I guess you have to start low, since it's part of the MCU, but I was expecting to see a lot more crazy dimension stuff.
The humor also fell credibility flat for me, Strange name scene aside. A bit surprising, because it's usually not an issue with Marvel movies for me. But perhaps it's because Strange himself was quite a prick, without ever developing past that. And when he attempted to do so, I didn't quite buy it. He wasn't charming enough to let his dickishness slide, like Tony Stark does. Being a charming prick and a prick with charme isn't the same thing.
I'll give the movie props for not blowing up an entire country, planet or dimension in the third act and final confrontation. It's something I'm incredibly tired of in superhero movies, so it was nice to have it a little more scaled back. It was actually one of the few moments where I felt they used magic creatively during a fight. It helps that it was visually really well done.
Overall, I feel like I wasted money seeing this in the theater. Renting it would've been enough.