The Four Corners programme was a complete disappointment. It merely followed the set-in-stone Malaysian Govt line that the pilots purposely took actions that indicate criminal activity.
There was no effort on the part of FC to speak to any aviation tech people, or to investigate the other possibilities such as contraband cargo, on-board fire or explosion.
All in all, the FC investigation was pretty poor, and merely showed up what we all already know - there's simply a lot of incompetence amongst the Malaysian leaders - in the Govt, in the military, and in the aviation arena.