Has that actually been studied? I mean, is there a quantifiable "2 second impression" that can be measured as different between Roboto and Source Sans? I see this kind of argument made all the time by afficionados of some aesthetic or another (microbrew fans, car nuts, etc...) and invariably the science ends up showing that e.g. wine quality can't be measured objectively at all.

My point here isn't (ahem) "You are wrong.", but more that I think you need to get some perspective about the distinction between strongly held opinion and objective fact.