Many of the posts nail it: the Glock just plain works. Accuracy, ergonomics, trigger pull, et al., is good enough for a defensive piece. There is a reason why the company has done so well; the product works as it should.
But many, myself included, have moved on to other options. That, and for want of a better term, it has no "soul", in the eyes of some. Yes, I own one, but hardly ever shoot or carry it anymore, as other arms have filled the rôles it once had. I suppose I could sell it off, but meh, why bother.
At the end of the day, if the Glock works for someone's needs, it is a fine option. Though I still cannot countenance a Hi-Point. Everyone has a limit.
I train with mine in real world environments. They all have scratches and wear from it. I don't care at all. What I care about it knowing if I ever did need to rely on them, I have no doubt they would function.
My 1911 is stored away safely, my Glocks are ready for action. Enough said.