Vim is a weird editor and it works. The default scheme makes it super hard to see comments and there could be important things there. For example commented options for a given service.
Here's a video walkthrough
To change the scheme you need to press ESC key and then
This will allow you see things more clearly.
To set the Vim's color scheme globally and system wide you need to create/update /etc/vim/vimrc.local file and add this line
press ESC key and then press ZZ to save and exit
You're all set.