What am I missing? Is there something inherently better about them that once you shoot them you have an ah-ha moment?
Depends on the person with the pistols in their hands. Just like some people can't understand why somebody prefers the fit and feel of an over and under Citori Gran Lightening for bird hunting, versus a Mossberg autoloader
I have had several 1911's; I'm down to a Dan Wesson 10mm Classic Bobtail, and it feels great in the hand. But it doesn't feel as good in the hand as my C series HP.
The thin Spegal and Navidrex grips make the HP feel even better, and even though I have Aluma Thin Grips on the Dan Wesson bear wrench, making it thinner through the grip as well, the High Power still feels better in the hand.
I have two MkIII High Powers in 40 S&W; also with thin grips, but they don't feel quite as nice in the hand as either the C series HP or the Dan Wesson bear wrench.
All my HPs came with the rowell/ring hammer rather than the spur hammer. Ditto the 1911. No hand biting goes on with any of them.
My C series, that has had nothing done to it other than having the tiny little original sights replaced with bigger MMC sights back about 1977, has a trigger that breaks at 5 lbs, complete with the magazine disconnect (which we all know will lead to your death) still in place. The Dan Wesson bear wrench came with a match trigger - 3 lbs. I suppose that is awesome for some; for me, that's too light for a bear wrench or other serious handgun when targets aren't the objective. I will get the Dan Wesson's trigger bumped up to 5 lbs as well.
I've always been bemused with comments on trigger pull weight. Once upon a time I took my Lyman trigger pull scale to work and tried a bunch of the triggers on our C7A2s. All of them broke right around 8 lbs, if I remember correctly. If an 8 lb trigger break works fine on a rifle equipped with a butt and an optical 3.4x power scope, you wouldn't think that an 8 lb trigger break on a pistol used by the same soldier with open sights would be a killer disadvantage.
I prefer the original safety that can be wiped off with the inside of the thumb; it stays out of the way and doesn't get moved during recoil or changing your grip. The ambidextrous safeties on the Mk II and III I find get in the way of my grip, but they're not too bad. I cordially dislike the big paddle 1911 CBOB safety; one of these days I am going to take a Dremel to it.
The Practical came with a trigger that is an unbelievable 16 lbs; Don Williams said he wants to do a trigger job on it for free, just so he can see what the hell is going on. That isn't going to happen for a bit yet.
Glocks, as charitably as I can put it, feel in the hand by comparison like somebody mounted a brick to the top of a cut off piece of hockey stick. For Philistines, like a Mossberg semiauto instead of a Citori over and under, a Glock is a suitable handgun that being gracelessly pawed and fumbled won't make much difference. The SIGs... meh.
If the hammer bites, the rowell/ring hammer is a drop in exchange. Mag disconnects can be removed for those want really light trigger pulls and those who can't figure out how polish things up with the magazine connect in place. Like S&W K frame revolvers, it's weird how the trigger pull gets better and better the more you pull the trigger. Thin grips of the Navidrex variety, Spegal, the old Uncle Mike's Boot Grips and a host of others are available. The Mk II and III sights are more than adequate. If that's still not good enough, there are lots of drop in options available; Novak probably being the most popular.
This clone/replica from Springfield Armory doesn't look like it has anything to complain about with it. It will be interesting to see if they offer some additional variants: stainless steel and maybe a shortened alloy framed Commander style version like the Argentinian FM 90 Detective model.