What percentage of users were affected? Also, how long since GDrives' latest outage?
Certainly, it sucks to loose access to data for (up to) an hour, but it's not clear to me that this should even be counted as a fail.
NO system is fail-proof. You make business decisions regarding acceptable business risks, and the costs needed to achieve that. If G's engineering beats what you can do in-house, go with G. If not, don't.
Of course, if you never sat down to figure out your business risks in the first place, there is no helping you.