As expected this is a bit of a propaganda movie against BP but that was of course rather expected. It is still watchable. The dramatization is fairly well done and the effects are believable as well as enjoyable. If you watch it as a disaster drama and special effects movie it is definitely okay.
As a documentary, well I would say that it falls short. The movie only covers the initial explosion. Once the platform is evacuated the movie stops. I am somewhat disappointed at that. I would at least have liked to see the attempts to put out the fire. Where are the scenes with the boats trying to... read the rest.