Earlier quoted context omitted.
Yet, if we look at Google's track record, they have much better luck with technical problems than with people-interaction problems. Search driven by algorithms - excellent. Social networks - epic fail. Advertising backend - money juggernaut, mostly driven by clever algorithms, as I understand? Mobile OS backend - great (well, ok, not too bad). Mobile OS frontend - meh. Chrome is kinda borderline, but I think technolo…
You're forgetting important Google products where design or user experience played a crucial role in winning. Gmail - the dominant webmail platform that made pioneering use of AJAX; before it you had to refresh the page to check if you had new email. And whose inbuilt chat client crushed Yahoo Messenger/MSN/AOL. People came for the 1GB of free storage, stayed for the friends they made on chat. YouTube - Video juggern…
Gmail:
From my hazy memory of the time it was released: 1. Best usage of AJAX and providing complex interaction without refreshing the page. 2. More storage space than any other provider.
Both, technical feats of excellence?
Youtube:
It was an acquired product, and there were quite a few points at which the YouTube community reacted angrily to Google driven changes, prominently when they made Google+ mandatory for comments.
GPS, Orkut, Chromecast and Homepage decisions: I agree on your point here.