While I respect your opinion, I have to disagree. For the most part, Android phones are made from plastic.
And I disagree that materials are just "perceived" as higher quality. Metals are more durable than plastics. That is not my false perception. Why do you think large structures meant to be sturdy are made from a kind of metal? It is not a false perception my friend.
This is also not just a false perception:
http://www.androidauthority.com/iphone-5-vs-samsung-galaxy-s3-drop-test-116898/
While you can argue that the video in that link isn't exactly "scientific," to which I would agree, it is still not surprising that something with an aluminum backing and aluminum band held up better than something made of plastic.
I am not trying to start an argument about build quality here. I personally preferred the premium feel that iPhones typically have. There are some Android phones that give off that premium feel, and the Nexus 4 has been talked about in this sense on many reviews, which is one reason I am trying it out. But make no mistake, metal being more durable than plastic is not just a false perception.
Being a bit vague aren't you? By metal you mean Aluminum and by plastic you mean some type of polycarbonate.
The handgun in my avatar (Glock) has a plastic frame which is renowned for its durability. Where as many Aluminum frame hand guns are renowned for cracking an failure. They do not use aluminum in sky scraper reinforcement lol.