My impression is that the Beretta 92 is not a terribly easy pistol to shoot, at least for some people. It certainly is not the best for those with smaller hands.
I say this because some people seem to be able to coax remarkable accuracy even out of a stock 92FS/M9, yet I have heard many folks say they couldn't hit the broad side of a barn with a Beretta 92. There can't be that much variation pistol to pistol.
I do agree that the stock Beretta 92FS/M9 is oversprung, at least so far as the mainspring goes, and going with a 16 lb mainspring makes a remarkable difference in shootability for many.
Even though I have been shooting my Beretta 92FS for a good many years, I still feel that I am not getting the accuracy that it is capable of out of it. My 1911 or SIG P229 just seem to shoot more naturally for me.