I'm sorry, but that's a load of pretentious BS. Y! Finance has all the same data and has 15x the traffic of Google Finance, for good reason. Source: http://247wallst.com/2012/04/24/will-google-dump-google-fina...
If your traffic figures are accurate, that only goes to show you how many unsophisticated market participants there are.
Such as blogs dedicated to investing, like 247wallst.com, analyzing data from comScore? Here's another investment blog discussing which one is "better" (see comments), http://www.ritholtz.com/blog/2009/08/yahoo-finance-vs-google...
Do all the day traders in the Y! Finance message boards qualify as a "online community related to investing"? Do you think they prefer Google Finance? Probably not.
Here's a relevant Quora discussion, "Why did Google Finance never overtake Yahoo! Finance?" http://www.quora.com/Why-did-Google-Finance-never-overtake-Y...
I'm not saying Google Finance doesn't have value, I'm just saying the burden of proof is against you since everything out there points to the opposite of your statement.
I'll close with this NYT article that argues Yahoo dominates Google in Finance products, http://www.nytimes.com/2009/08/23/business/23digi.html?_r=0