The pickled frame on my early blued .44 mag Vaquero is wearing nicely, looking great with the rest of the blued gun. The stainless Vaquero I bought at the same time is not aging as well, retaining most of it's lustre, but I like it just fine.
One of my Uberti .45s from the same era has that odd 'fire blued' finish that is aging nicely. It doesn't wear well and I've let it happen naturally. Some enhancement might actually improve it. It's companion is the standard dark blue and just starting to show wear.
I've never quite understood 'antiquing' a gun, as in the historic era, it would have looked like what it was - a fairly new and valued tool that saw daily or frequent use. The more service, the more marks. Honourably earned 'hash marks', like some scars, add character, each one a chapter in a story. But, I admit that some 'antiqued' guns look interesting.
Where I have problems is when it accentuates wear like a lot of 'tuning' and 'actions jobs' I've seen. I'm a believer in "if it ain't broke, don't fix it."; letting things wear in naturally rather than speeding up the process. I like my women (wife) and my guns to look too damn young for me .... ;>)