Transformers: Dark Of The Moon even retconned some face lights into the helmets of the Apollo 11 astronauts, which would have resulted in them staring at their own reflections.
It was imperative that you knew Neil Armstrong was being played by, you know, that guy.
Obviously, even without reflective helmets, these things would function like pure dogshit. Rather than being able to see their way around dangerous and unknown terrain, these helpless astrohunks are going to have a constant beam of bright white light pointed at their eyeballs. They'll be fumbling around the moon like Mr. Magoo, except when you trip in zero gravity, you fall forever.
"How are we gonna blow up that asteroid, Matt Damon?"
"No idea, Ving Rhames."