Everyone tends to look at things through their own prisms for sure. Upthread a comment was made that you had to be a bigger guy to conceal a Glock 19... which IME, isn't true. I'm not particularly tall, nor big (170lbs if I've eaten a nice steak that day), and I've concealed a Glock 19 of one sort or another for nearly 20 years. I generally don't wear fitted T-shirts, but I don't dress like a slob or wear huge "gun burkas" (hat tip to @
Tamara) ... though you'll usually find me with some sort of patterned button down shirt in summer or flannel in the cooler months. Proper holsters, belts, and clothing selection makes concealing a G19 fairly easy.
I'm also not really willing to compromise shooting a smaller more easily concealable gun, like a 365. For most folks, they will shoot a Glock 19 better than that smaller gun, and that includes the bigger 365 variants. For some folks, that works, and their trade off comes out different. I will say I can shoot my G26 almost as well as a G19... and sometimes carry it instead of the bigger gun. But if I had to choose one or the other as my only pistol I'd take the 19 every time. I've shot a few 365 variants, and for me, they don't shoot as well as the old standby 19. That is absolutely not a knock on the 365, as they've turned out to be pretty awesome guns that work for a lot of folks. They fill a niche that a lot of folks think they need, and Sig will continue to sell a crap ton of them.
There are guns that are better for specific things, and some folks may have a preference for some other specific pistol, but I still firmly believe that the Glock 19 is firmly top of the heap as far as a general purpose jack of all trades sidearm for general issue to a wide variety of folks, when you take all it's qualities into account.
Is it the best gun ever or "Perfection" ? No. But its pretty damn good, and can be pressed into service and put to good use for probably 80-90% of uses... especially if one is willing to learn the quirks of shooting a Glock well.