I'm not a glock guy at all. But for the reasons I've listed above I would define them as a standard entry level gun.
A lot of gun ignorant people call any type of pistol a glock.
I've not heard or witnessed people stovepiping glocks. Not saying it's not possible but that's not their reputation. As far as their production runs right off the line they are generally fine vs a Taurus which is known for piss poor firearms right off the production line.
There are poor quality gun manfuactuers out there , Taurus, Jimenez, basilla, Jennings, hi-point.... Then you get into good to excellent. These are guns that generally have a lower price range and offer good quality, and reliability but you're going to trade something bad for something good. I.e no interchangeable iron sights, or accessory rail, bad grips, etc (Walther) but great good trigger and vice versa.
As far as glocks I don't believe there is a "perfect" glock. For the money you would spend upgrading a glock to "perfection" you can buy a great gun right out of the box.
It's going to come out of the box pretty decent and from there if you want to customize it, i.e add new trigger, back plate, barrels, and add components it's too easy to do so. Glocks are known to be cheap to accessorize. At least they were about 15 years ago.