It's unfortunate that he still has a robot voice, but not much Riot can do about that until they redo his VO someday so that he has an unfiltered voice on file (unless they have one, in which case I think it would be worth the effort to change the filter).
I feel like the texture on his front Torso could use something, but I'm not sure what. In a similar vein, I feel that there may be some concern with his ult washing out his gravity field's textures.
Overall though I am very satisfied with the skin ( I may even use it as much as prototype and machine), I just hope Riot doesn't let a champion return to no skin in three years status ever again.