I own 2 Glocks one is the model 27, .40 Caliber the other is a model 20, in 10MM caliber. I carry the model 27, every time I leave my home.
I have many other pistols from SIG, H&K Colt and Detonics.
I think that the claims made by the first article you posted are a bunch of crap that was written by a biased anti-gun person, who has little data on the Glock or fireaems in general.
There is nothing wrong with the Glock pistol's trigger mechinisim. It is not a light trigger pull as it comes from the factory IMHO. It is a harder pull then my SIG 226, or H&K USP .45, which are not what I would call an easy trigger pull either, when you compare them to a cocked and locked Colt .45.
The trigger pull on a factory Glock also exceeds the trigger pull on a double action S&W revolver, which the NYPD was armed with prior to the Glock. The NYPD also had their issue Glocks modified with the 'New York' trigger, which made the trigger, even harder to pull.
That all said, IMHO, trigger pull, the Glock Pistol, etc. has nothing to do with the incident, except that since the adoption of high capacity semi-auto pistols by the major police departments, the number of rounds fired in police firefights, has increased. Not surprising is it?
I hesitate to condemn these officers, without all the facts; however, 50 rounds to me, does seem excessive, particulary when, so far, no mention of the people in the car firing at the police, nor has any firearm been taken into evidence. The one officer who fired 31 rounds, if he indeed, fired all of his ammo, broke one of the rules of gun fighting by shooting his pistol dry.
There is also the fact, that NYPD are not supposed to fire on cars, being used as weapons, according to what the NY Mayor, said at a news conference today. I don't quite understand this, as if someone tried to run me over on purpose with a car I would shoot him, and be alright with my Departments policy. The car becomes a deadly weapon.
Here is an article on Glock Triggers.:
http://www.findarticles.com/p/articles/mi_m0BQY/is_11_50/ai_n6209982