Use Google Drive… ? Oh sure, use it:
If you want Google to be able to use, re-use, and plagiarize your work. http://blogs.wsj.com/cio/2012/04/26/google-drive-sparks-privacy-concerns-among-businesses/
If you are ok with Google claiming rights to use your work and content in its ads or potentially make it public to the world (if you forget to flick a certain setting). http://www.wired.com/cloudline/2012/04/google-drive-privacy/
If you are ok with Google scanning and analyzing the information you store with them for anything from ad targeting to building a profile on you for selling/sharing with advertisers and marketeers. http://www.csmonitor.com/Innovation/Horizons/2012/0426/Google-Drive-says-it-may-publicly-perform-your-files.-What-s-that-mean
In short, use Google Drive if you really don’t give a damn about your privacy, your intellectual property rights, or pretty much anything else you might naturally and reasonably assume a company ought not be able to do with YOUR stuff.
As for me? Er… thanks, but no thanks.