[stan_rogers]

They've made a concerted attempt to add a social layer on top of the core Google products...

That is the problem with G+ for me in a nutshell, and the reason why I killed that part of my Google account. I rather liked Google+ as an environment; it was the spillover into the other Google properties that I found irksome.

Frankly, I don't mind so much that Google learns a little bit about my habits and develops recommendations that are in accordance with them. But when I visit, say, YouTube, I would like the recommendations driven by my tastes (driven by my history) and subscriptions/follows -- I don't want political or religious/anti-religious rantings driven by my professional colleagues, pseudo-scientific claptrap shared by my (otherwise interesting) meatspace friends, and so on. They've already shared that stuff on G+; I don't need it pushing down stuff that is likely more relevant to my interests (or needs) on other Google properties.