Sorry, but IMO there's no comparison between the government-issue pistols made by Colt and current production. The GI Colts were made using old-world crafstmanship which involved a healthy dose of hand-fitting, and all the parts were machined steel. Nothing was cast or plastic except for the grips. Even stamped parts weren't used until near the end of the war. The contract guns were a little rougher internally and externally, but they still functioned 100% all the time (thanks to a very strict quality assurance process by government inspectors). I don't know where the argument that GI guns were poorly-fitted comes from either. My GI Colts are tight, smooth, and have a flawless exterior finish. I've only dared to fire one of them due to their value, but the one I do take out and fire (a 1943 example) shoots better groups than any other 1911 I own aside from my two Kimbers. I think most complaints of ill-fitting GI guns comes from well-worn examples that have been kicked around for awhile in the service.
Modern commercially-produced 1911s take advantage of modern CNC manufacturing techniques and cheaper materials like cast, MIM, and plastic components. But overall the quality has dipped thanks to high production costs, and unless you spend the big $$$ for expert hand fitting (as seen on Wilson or Les Baer guns) you'll likely end up with a temperamental weapon. I'm not saying nobody makes a quality 1911 anymore, but on the 1911 forum I'm simply amazed at the complaints so many folks have. Plunger tubes falling off, feeding failures, rough triggers, and broken small parts to name a few.