The lawsuit is going to be a loser, based on the FACTS, but might win based on the jury's FEELINGS.
The Ruger New Model action came about because of that. ALL the facts showed the USER was the cause, but the jury FELT otherwise.
This suit is a loser, to me, simply and directly on the face of it, because of the claim that the GLock design is defective.
It's not defective. It's WRONG (my opinion), but its not defective.
It is interesting to note how, over the last century +, we have come nearly full circle. JM Browning didn't put a thumb safety on his prototype .45. He felt the grip safety was enough. Though a design genius, Browning wasn't a combat user. The Army (specifically the cavalry) wanted a thumb safety, so Browning added one, and the result became the 1911.
Today, we have a number of people who don't want a manual safety on a combat/duty pistol. The argument I hear most for this viewpoint is that the 7user may "forget" to disengage the manual safety, and therefore be at a potentially deadly disadvantage.
I will not dispute that this has, on occasion, happened. However, I think that over a century's use of various models of semi autos with safeties, in both war (combat) and peace (police use) has proven that while it sometimes happens, it is not a general problem.
The "no safety" crowd also disregards numerous documented instances where a shooting didn't happen (most likely a life saved, usually an LEO) when the bad guy got the gun with the manual safety ON, and didn't know/realize how to disengage it.
The Glock "trigger activation switch" type safety is mechanically safe. It, combined with other design features makes the gun drop safe. Arguably not AS safe as some other designs, but it is safe.
IT IS NOT USER SAFE!!! (Nothing IS), but the Glock system requires fewer things to "go wrong" than some other designs.
This is not a defect, it is by INTENT! You may disagree with the design intent, (I do), but you cannot honestly say it is defective. On that basis alone, the lawsuit should lose. GLock is responsible for the way they make their guns, very true. But they are not responsible for the way people use or misuse them. Nor is any other gun maker.