For older people (35 and over) big icons with easy to decipher logos will make the experience easier.
Maybe you mean people in their 50s or older. People in the 30s have been using personnal computers since the DOS days.
Big icons just waste space.
Anyway, the issue here is not Metro itself, read the article, it's basically forcing Metro on the user and requiring manual intervention on each subsequent reboot instead of letting the user automate the process of switching back.