There really are two sides of the fence on this one, but almost everyone is inside the fence on the Glock side.
As someone who does not like Glocks, I will say, it has nothing to do with the gun, it's my hand. I'm the first to admit it. My hand is prejudiced against Glocks. It clearly favors 1911's, XD's and revolvers. I've given up on trying to rid my hand of it's prejudices and learned to live with its shortcomings.
Glocks are fantastically reliable. There are a ton of parts out there for it (factory, after market, upgrades, etc) and there are a lot of Glocks out there in general. Glock aficionados are easy to find and lots and lots of gunsmiths are familiar with them.