I feel that if the colours were better integrated through the body it would look better.
I mean if the chest had more grey highlights and the arms had rust highlights then it figure would look better. I guess putting that much work into it wouldn't be worth it. I don't imagine this figure selling that fast but what do I know? I'm not as hyped about it as the speaker in the video but I think it's cool. I think the head and face is the best part of the figure.
It's probably for cost saving with the shoulders (Much like the dull bumper in alt mode), maybe a bit of rust on the shoulders would be nice, but I can see why certain bits are just bog-standard to save money. Despite being 3-D printed I do like the chest colors, perhaps just not covering over the hedlights to add some defintion would've helped.
I do like the figure though, and yeah the head is real nice.