I love style guides, I really do. I see style guides as being essential when working on a team because there is so much that can be done just a little bit differently that might have a frustrating effect on another teammate.
I’m not proclaiming that everyone should be embracing and using Google’s style guide, but instead heavily encouraging everyone to use one of their own. Using Google’s as a template to make sure you’ve got all your bases covered is a good decision as well. There should be reasons behind your style guide. Sure some will be personal preference, but as long as the team agrees on it, go for it.