You don't need aluminium for a strong laptop. Samsung and Lenovo prove that.
I'd like to see proof of your battery claim.
Screens vary. A $200 netbook won't have the same screen quality as a $1500 macbook or laptop.
GOOD machines hold their value, mac/pc or not.
Macs are not malware free, even apple admits it:
http://support.apple.com/kb/HT4651 - as for stability, most windows laptops come loaded with bloatware. Easily fixed by a fresh install of your choice of operating system.
Drop a macbook and a laptop from 6ft, I guarantee you neither will survive without any form of damage, cosmetic or internal. Likewise, keep a macbook or laptop turned on on your bed blanket all day and it will overheat and eventually die.
There are large numbers of free and paid professional studio programs for any platform, windows, osx, linux or otherwise.
Macs are NOT good value for money for your average student. Students need laptops that can do word processing, browse the internet and that's it. As for 3D modelling, your basic integrated graphics chip on any mac or pc is enough for that. Good luck upgrading your mac to a professional grade video card designed for cad work, however.
In short, all of your arguments are null and void, and you are speaking from ignorance.