First ask yourself what makes a pistol easy to shoot well. The answer is:
1. Trigger
2. Sights
3. Ergonomics
A short, light, crisp and consistent trigger is the easiest to shoot rapidly with accuracy. No other semi-auto trigger (with the possible exception of the SIG P210) meets these requirements better than a 1911. Handle a good one and you will see what I mean; handle a great one and you will be spoiled for life. This is at the heart of the continued usefulness of the 1911.
As for sights, some 1911 pistols come with great ones (e.g. SA with Novaks) and some don't, but if there is a sight out there it is available for the 1911 so if the gun doesn't come with it, the shooter can always get what suits them best.
Ergonomics describe how well the weapon "fits" the shooter. The most basic 1911 has very good ergonomics. With its single stack grip and short trigger reach it fits many people well, and the simplest adaptations (short trigger, thin grips, flat mainspring housing) will make it fit even the smallest of hands. Especially with a beavertail, it has an extremely low bore axis that aids in controllability. Contrary to the ferocious reputation of the .45 ACP, the 1911 is a soft-shooting gun in almost any caliber.
It is also very concealable for its size because it is very flat, making it a reasonable proposition to carry a full-size 1911 IWB.
So either stock or with MINOR (note emphaisis... we aren't talking adding $1,000 to the sticker price
) the 1911 has qualities that are literally unsurpassed by any more "modern" sidearm.