I own several pistols, two Sigs with DA/SA, three HK's with DA/SA, a HK squeeze cocker and a SA only DE. I had a Colt 1911 and plan to purchase one again soon.
So I have an exposure to various trigger types.
I have heard a number of comments on the triggers in HK's.
I would agree they are 'ugly' in double action, but in DA my Sigs are no better.
Besides I never shoot double action, so an ugly DA pull is not an issue for me.
In single action, I don't find any of my HK's bad at all.
My HK45 and Mk23 supposedly come with a factory trigger upgrade, however, when I compare my USP to them, I really don't feel much of a difference in single action. So even if they were easy to find, I'm not sure a factory upgrade trigger will improve things much.
I have heard of guys getting a gunsmith to 'do' the triggers in pistols, including HK's, so that may be an option.
However, again I don't feel I need to pay money to get work done on any of my HK's, including the USP.
Something that no one has mentioned, and I'll add here. I know there are other polymer guns available that cost a few hundred dollars less than a USP, but most of them are striker fire. I'm an 'old fart', and as a result I much prefer a pistols that has an exposed hammer, plus a mechanical safety, as I feel this offers a safer gun than a striker fire.
The reason I own HK's, Sigs, DE and soon again, a 1911. I will never own a Glock!
Flame away!!!