When G+ started out, it was clean, fast-loading, reliable, and did exactly what it was supposed to do and no more. You know ... like Google used to be. I had real hopes that G+:FB::Google:Yahoo.
Every change since then has made it uglier, slower, and buggier; with the latest interface changes they've not only caught up to but actually surpassed Facebook in the amount of irritating crap they shove at the user. Google may be able to coast on people's affection for them as a search engine (especially when the competition is Bing) but they're going to find it increasingly difficult to break into new markets if all they do is ape the worst behavior of the existing market leader--which in this case emphatically includes "adding a bunch of new 'features' when the ones we already have are kind of crap."
I still use Google as my primary search engine, Gmail as my e-mail provider, and Google Maps when I want to figure out how to go somewhere I haven't been before. Nothing they've done since then has provided any reason to switch from whatever solution I'm currently using. And I really don't think I'm alone in this.