It's quite difficult to understand why others involved in this investigation such as the NTSB, FAA and AAIB haven't expressed even the slightest dissatisfaction at the weakness and simplicity of the MoT's preliminary report on Flight MH370.
It's called diplomacy; complaints of this nature are not aired publicly. Adding to the complications: President Obama was in Malaysia this past week. Not a good time for the NTSB to critique the MoT report.