The legendary ending is a totally logical one. The whole theme of halo 4 is Chiefs journey now, taken out of his comfort zone and exploring the more personal aspects. I'll admit I felt somewhat shocked when I saw that section of his face, but this is like telling everyone that yes... he truly is human. It really drove it home for me. However I do agree with OP that... seeing a full face... it would do nothing but disappoint, you really couldn't live up to something like that. I'm ok with silhouettes and the like.