I believe they surpass the Glock. That's why a carry one of the four I own every day. I passed up the agency-issued Glock in favor of my XD45c, XD9sc, XD40sc, and XDm 3.8 40c.
Just because they haven't been around as long as Glock doesn't make them sub-standard. And that's exactly why Glock has the lion's share.... They've been around since the 80's and they work. There are other choices these days though. The XD/XDm "flaw" is that it hasn't been around as long as the Glock so as to build a loyal following. In ten years? Maybe...