Earlier quoted context omitted.
In the real world, the quality of a product isn't the only criterion influencing adoption/market share: There's also - price and cost (doesn't really apply here, though) - marketing and image - critical mass and network effects Therefore, your conclusion is invalid.
Price and cost matter a great deal here. Although the price of G+ was zero, the cost quite high - the user's time. G+ was hard to understand for most people. Google tried to give it a language of it's own that took people effort to learn - groups were "Circles", chat was "Hangout", and so on. It didn't instantly click in the way that Facebook or Twitter does for most people. Given that, the value proposition for G+ w…
That's a good point. I still don't really "get" Google+, and I find it somewhat counterintuitive.
> tl;dr G+ didn't provide enough value to users to make it worthwhile spending time with the product, ergo it was a bad product that people didn't spend time with.
I was challenging your "few users ==> bad product" line of reasoning in general, not necessarily the statement "Google+ is a bad product". Sorry, I should have been more clear on this.
Still, I stick to my point that there are more factors influencing the market share of a product than its pure quality. Even if I made a better Facebook clone, I wouldn't gain any noteworthy market share.