Got my Oly back in 1989. Very fine machine work and anodizing. Inside of the receiver smooth as glass. Can't praise them highly enough. Accurate, primo.
I've heard less complimentary things about the new ones, but can't speak first hand.
I hear people complain about the high-temp paint they use now instead of anodizing. Matter of taste. The paint IS mil-spec, is easy to refresh, and is tougher if not as hard as the anodizing.