Recently an article on HN front page was about a guy who had to file down his MBP because the front edge of it was too sharp and resting his wrists on it hurt his hands. At least two people in the comment section noted how the sweat on their hands over time caused the sharp edge of the MBP chassis to pit and it caused it to turn in to a sharp serrated edge that actually cut their hands.

You can say other laptops are "plastic and shitty" all you want, but Apple's offerings aren't necessarily the best thing out there either. I personally like variety, and you don't get that from Apple. I can choose from hundreds of form factors from a lot of vendors that all run Linux and Windows just fine, plastic or not.