Can't say that I've done the testing to say that it shoots EVERYTHING well. What I can say is that I'm amazed at how far rifle accuracy has come in the last decade or two. It used to be that a sub MOA capable gun was a pretty expensive and involved proposition - not to mention a sub MOA semi-auto rifle. Today I've got an AR-15 that is consistently sub-MOA (when shot from a bench or prone off of a bipod - not even in a sled) that I self assembled and that cost me less than $1000 to build a couple of years ago (yes - I shopped sales). The upper is a $360 PSA .223 Wylde 1:7 18" stainless heavy barrel with their "decent" BCG. The lower is pretty vanilla - save a good trigger (SSA-E) and a Luth AR adjustable stock...
I've shot a variety of match grade heavier bullet 5.56 through it and have not found anything so far that won't shoot sub MOA. Most of the stuff through it has been IMI 77gr SMK 'Razor Core' match ammo or Frontier 5.56 NATO 75 gr BTHP Match. Best 100 yard group ever was 0.39" but the more typical is in the 0.65" - 0.85" range. I'm guessing that a better shooter would shoot consistently near the lower end of this range.