In the movie the robots generally wear armor to and masks to protect themselves from the environment and stuff.
This one is basically a nudist.

This robot is beautiful in it's own way
STAND UP TO ROBOT RIGHTS!
What's a synth I don't know what you're talking about

nah son minimalism is the real ****
go watch age of ultron again if you like generic baddasses now in metal flavor

Nothing wrong with minimalism, but my issue is how disproportional and inconsistent the design is. The torso and head have angular shapes and are roughly the right proportions of a human being's. Then you get to the limbs and they're way too thin, and look scavenged from something else and repainted. Honestly, they look like prosthetics and it ruins the look of the whole thing.

It's a machine missing the exterior aesthetics, like a car without the exterior, or the bare bones of a computer. No casing. And the torso and head probably have all of the essentials of the robot, like an energy source and computer, while the arms and legs are only for movement and interacting.
Humans need more muscle mass on their arms and legs, while a robot would only need a simplified version to achieve the same results.

Remove the angular plastic pieces on the head and torso and they'll look like the limbs.