You're not grasping the concept here. The firearm is accurate, the inherent accuracy of most firearms is far beyond the capability of most users. Glocks are no less accurate than any other pistol on the market. The less than "easy" trigger on them makes it difficult for new and untrained shooters to operate them with any level of proficiency. Its not the gun, its you, the shooter that sucks.
Learning the fundamentals on a pistol with a short and light trigger is ignorant. It fails to illustrate the shooters mistakes and offers a false sense of achievement. Couple that with the reality that 99% of firearms owners have no professional training, and its not surprising that most feel Glocks are inaccurate, or that this add on or that will improve performance. The ironic part of these statements, is that the shooter blames the gun, then feels that more bolt on crap will solve the problem. Never once does the shooter ever believe it is them who needs work. Even though anyone with a firm grasp of the fundamentals can shoot any pistol(or rifle) well regardless of make, model or calibre. The novice or poor shooter still can't see that the problem is him/her.
I've taken two new shooters out in the past month. A coworker who put his ego aside and LISTENED to what I told him. His groups were consistent and respectable at around 5 inches at 7 yards. He had never fired a handgun or any other firearm in his life. Running a Glock 17 with those awful big dot sights. Total rounds fired in his lifetime at this point. About 150.
The second shooter is female, we were at the range not two days ago. Women unlike men have an uncanny ability to LISTEN to instructions and do exactly as they're told. At seven yards she could print a similar 5-6" group with the same Glock 17, and she was shooting rapid fire. As fast as she could reacquire sight picture, she was sending rounds. Four magazines consecutively(I couldn't load them fast enough). Same results were achieved with the AR and iron sights at 25 yards(max distance). Her total round count(in her life) at the end of this trip. 600 combined pistol and rifle.
Poor performance is most likely a result of the shooter. Whether that be due to inexperience or lack of quality instruction, it doesn't really matter. A poor shooter blames his gear or believes he needs special gear to be successful.
TDC