Hmm, not sure about measuring providers based on their status feed.
Have to say this seems a bit unfair on Google. We use them and several of their competitors and regularly note that we are told about incidents that aren't actually affecting us with a ratio of about 10:1, and have never seen a service impacting incident not be documented.
With other providers, the ratio seems to be the other way around and we only see proactive information from the provider about a subset of incidents that do affect us.
Google aren't perfect but judging providers based on the volume of their own incident reports is just penalising the better developed folks with good processes and pro-active incident reporting IMO.