Here is some insight into Battleship visual effects production at ILM. Notice the huge number of shots and the fast pace of getting them to final. By the end of the production having around 600 shots in progress and 6 weeks to get them finished, with the high complexity and quality set to match Transformers level. This is very typical on different scale for most of film post-production today. The quality needs to be pretty good but also with quick turnaround including client changes. And apart from great artists and tools that we see in the documents, it is often a success of robust flexible pipeline.