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Usually after a couple of hundred to 1000 rounds the gun should be broken in. The brass shouldn't be kicking back in your face. It's more of a minor nuisance to me than a big issue but it should work itself out. Keep it cleaned properly and break it in. You might see it taper off.
The Gen 3 9mm's would do that with the 336 ejector. Call Glock or Glock Meister and get the replacement 30274 (30275) ejector to fix it. It's a $7.00 item.
Rented pistols did that to me, which is one of the reasons I bought a revolver for my first handgun. Some people online told me it could be the guns or it could be I as a new shooter I was limp wristing it.
I can't really speak on that Glock....but auto pistols are funny machines. I've seen guns that would throw every case off in a different direction with each shot. I've seen others that if held steady would put all the hulls in a nice little pile. I watched a fellow at the range, bench shooting a black rifle of some sort, and it was ejecting the brass ten yards and you could have covered the brass pile with a pie plate. Your issue could be as others have stated .... a mechanical/design problem, maybe just needs a break-in or ammo change. Always wear your eye protection.