Can anyone recommend any articles/blogs/etc on big data success stories outside of ad tech and retail web tech? And I mean big, business defining successes.

It's not to say they don't exist, obviously analytics is super important, but after being involved in it for 10+ years, it is rare that I have seen any game changing results come from big data analytics teams. Lots of small incremental improvements, sure, but I wonder about the ROI given the infra costs.