I agree, it is kind of sad. Most of the carriers have never really given it a chance or put it in a place in their stores where potential customers could look at and play with it. I'm in Western Washington, so I'm pretty certain it has a higher market penetration here. In my office (and no, I don't work at Microsoft), it seems like we have a fairly even mix between iPhone, Windows Phone, and Android devices (to be fair, many people in the office came from Microsoft and had their WP devices subsidized while there).
Outside of work, I have several friends who also use WP - a couple in the insurance industry, a couple students, etc. All of them seem pretty happy with them.
Each of the 3 OSs has some benefits over the others, but when compared side by side I wouldn't say any is at a clear disadvantage. WP probably has the best hardware quality available with the iPhone 6 a close second, Android is easily the most customizable, and iOS may win in the "mostly just works for everything you really want to do" department (has all the apps and the simplicity/consistency of UI).
So, to each their own, but counting out WP just because "it's Microsoft" or "because WP7 sucked" is shortsighted at best.