Iron Man 2 is considered one of the worst MCU movies, it's confirmed there was studios interference from Paramount.
I actually really enjoy this movie. This movie is also important to setting up the Avengers and introducing War Machine. The movie also recasted and gave us Don Cheadle as Rhodey/War Machine, a better casting.
The movie does have problems, like honestly this should've been Armor Wars, since the movie deals with people trying to copy the Iron Man technology. Also, Whiplash really shouldn't have been the villain opposite of Hammer, they should've done like Crimson Dynamo or Titanium Man.
The MCU has had worst movies, and there's worst movies in general. I enjoy the movie and RDJ, like always, nails the role.