It looks -Yoinking!- great, I really don't see why some people are upset over this. Chief is supposed to be a super soldier, and not some little lightweight Instagram model.The bulk is fine, but i think the gap between the upper arm guard and chestplate should be a little bit bigger, because now it looks like his range of movement is impared.
my previous post has an ajusted image.
That's because he is not standing up straight in this picture.
Also, losing some range of movement is unavoidable in effective realistic armor design. Because you want to keep the potential weak spots as few and as small as possible. What matters is that the soldier can still fight effectively while wearing the armor. Soldiers does not need to be able to do backflips etc, that's just a bonus.