been shooting a glock 19 & 26 for the past 8 years. recently got a full size 1911. at first i was shooting the 26 way better than the 1911 (50 yd steel). needed to change my grip, properly grip the 1911 which is a very differnt grip than glock. once i paid attention to proper grip with the 1911, my shooting got better. with the glocks, i can just grab the gun and not think about the grip. with the new 1911 , i have to think about the grip. i just need to put the time into the 1911 to get comfortable with it, also need to do some wieght training as a full size steel gun is heavy!
my conclusion, its not the guns fault.... its like mac vs pc. cant shoot a glock? practice with the new grip and put 1000 rounds downrange. dont expect to shoot any new pistol as well as what you are proficient with right out of box.
i guess if you are lazy, blame the gun. as it applies to bullseye shooting, i can't comment cuz i don't do that.