All the guns I own, and I own many are reliable. Not to say any gun made cannot have a failure. Yes, I have gotten rid of guns in the past that are not and I detest a firearm that does not hold up to a lot of shooting without falling apart. However there are also other considerations. The gun has to have good fit and feel for my particular hand and a big test is how the gun feels to me personally with a lot of rounds fired in one session. Glocks are great firearms and reliable. However they have never been my cup of tea. I do not like shooting them. Do not like the grip, and hate the damn way they do their trigger guard. Always get a blister on my trigger finger with a lot of rounds down range. Interesting that PSA saw this and designed a much better version.
What I also dislike tremulousness is the VIBRATION when shooting a lot of rounds from a Glock or other loose tolerance pistols.