The only Glock I ever owned, I sold just over two years ago. I had it for three years, and put just over 1700 rounds of 9 m/m through it. I had difficulty adjusting to it's trigger action, and thinking back, it's still hard to nail down just one (1) solid reason. I can say I never liked it.
Another aspect (for me) is that’s it's hard enough to properly intro (new shooter) friends and family to the whole SA/DA game, and then have them actually achieve a good level of proficiency. I find absolutely no reason or niche for Glock's safe-action system there either. Should they ever become curious about Glocks (like I once did) they'll just have to get their own.
Now days, the memory of that abstract trigger system is still strong. So by adding in my other negative factors like their plastic sights and that "off" grip angle, I no longer consider Glocks worth the effort. IMO, there are simply FAR better choices out there.....but at least I tried.
They do have a tough finish though.