The phase 2 movies in the MCU can be seen to target the growth of the heroes in both power and personality.

We see Tony Stark blowing up his suits, Cap dropping his shield and Thor loosing his hammer. The newbies in their introduction are faced with challenges that shake the core of their beliefs and personality and having to rise above all these. Also increase in strength.

Ant-Man, Black Panther and Dr. Strange all underestimate their foes when the clash for the very first time. They get defeated, then they come back with a team and defeat the villains.

The one thing the phase 2 movies do have are the lack of villains with a legitimate reason to oppose the protagonist. They have reasons to be villains: revenge, pure evil and the plot needs a villain.

That's what distinguishes Black Panther from the rest of the other phase 2 movies is the villain. It has a similar predictable plot but a villain whose only wrong is an error in thinking and the lengths he goes to see his vision through. The reason is valid, great goal but bad method.

That's why for me Black Panther is the best MCU movie at the moment. Thor Ragnarok almost got it but it became obvious Hela was pure evil because she could, like all the villains before her.