I wish they would just get it right, and let me create different accounts for the apps I want to use. I just want a YouTube account. No Gmail. No G+. No tying my adwords account to anything else unless I request it.
This is extremely simple, and Google has made this horribly invasive and it's flat out broken at this point.
It's broken for me because I uploaded copyrighted clips to YouTube in 2006 with a username. When Google took over and linked my Gmail to YouTube and got serious about copyright, they banned me. So I have the pleasure of being able, as they seem to intend, to use one Google account to navigate all their services, except for one of the most popular because of petty offenses done in the early years of social media.
But we all know why they forced the unification of these accounts. So they can correlate our activity across services to "better serve us". (Read: serve us ads.)
Even if that is the goal (which is likely), it does not explain the need to force me to create accounts for applications I don't want, like Gmail. That's like going to a car dealership, buying a sedan and the dealership forces you to take five crates of crab apples with you at gunpoint.
It is more like a car dealership putting their dealership license-plate holder and the car make/model sticker on the back. And the crappy non-replaceable Navi system.
This is extremely simple, and Google has made this horribly invasive and it's flat out broken at this point.