I shot a Glock first and only time this past August.
I found that I could not hit as well as with my Browning Hi-Power.
Now I have a CZ 85B I know I did not hit as well with the Glock as I do with the CZ 85B.
In my family I am just an average shot. My brother can adapt to a new pistol faster than anyone. He too missed the six inch metal target and finally walked them in.
The Glock didn't meld quickly with the way we shoot. My opinion, it is "us" more than "it".