Google became useful and popular because it created tools that people want to use.
Since Google+, however well intended that project may be, Google has shifted to creating tools that it wants people to use.
Couple that with the fact that their search engine reached an apex some years ago and that virtually every change since has damaged it and made it less useful (particularly the insistence that people prefer millions of useless answers over a small number of useful ones - or indeed, a zero count that itself is useful), and you have a company that, currently, is in decline.
I don't think it's too late. I don't think Google is evil, or has bad engineers. But it needs to step back and ask itself if it's really going in the right direction.