Just seen the film, enjoyed it immensely, tho' of course not sure if all the presented "facts" were indeed "facts".
Yes, the NTSB are indeed portrayed as over-zealous, but if the "facts" that they were apparently presented with initially were indeed fact, then they wouldn't have been doing their job if they hadn't at least asked the questions.
ACARS. According to the film, ACARS indicated that the left engine was quietly idling all the time, and was therefore undamaged, and of course this was discounted when the engine was recovered and subjected to engineering analysis. In view of the fact that the missing MH 370 is being sought in an area derived from ACARS information - perhaps Malaysian Airways should ask Sully where to look ?