Anticlimactic boss fight

So we already knew that Dormammu would make an appearance in Doctor Strange. However, as far as I’m concerned, I didn’t expect a fight between the supervillain and the hero, let alone a fight as anticlimactic as this one.
Basically, Dormammu is depicted like a villain who has no patience – which is extremely weird, since he lives in a dimension where time doesn’t exist. We are led to understand that he kills Strange thousands of times. However, Strange is still a human. So who would have lost in the end? The immortal being or the human?
In a way, the resolution was as fun and as imaginative as the one in Guardians of the Galaxy. On the other hand, since there was a fight between Dormammu and Strange, maybe it should have been something more than just the Sorcerer Supreme being killed time and time again, in a boring way, until the villain lost his calm.
What do you think? What other details distracted you from the movie?
