Megatron Origin had incredible potential and an awesome concept for a kick ass story. Unfortunately its execution was very poorly done in my opinion.
Much of the art is messy to say the least, you have to concentrate too much to work out what is going on. The transitions from square to square are also confusing and sometimes feel random. Most of the comic seems to have the same shades of gray all over it which only makes the art even more confusing and sometimes frustrating. It would have helped a lot if important aspects in a certain scenes were highlighted with color but everything just blends in.
The dialogue is not only strange and poorly done but also lacking as there isn't much of it! This is the main flaw in my opinion, the comic relies heavily on its visuals to tell the story as there isn't much text but the art is so chaotic that it becomes counterproductive.
Overall it's alright for a Transformers fan as it does give you a few cool things that only fans would appreciate like what DirtyDigger mentioned but as a comic itself, its rather poor and the weakest IDW book to date.