I do sympathize with you OP, because i've had a HUGE amount of issues with my iPhone 5's and replacements. I am surprised they have not told you they have "flagged" your account due to the amount of replacements you have like they've done to me.
I have had every single issue verified by a genius, I am not sure your argument is valid in terms of getting a replacement due to the glass, but I would definitely just pay up, like you already did, and just cut your loses. I feel indifferent like you, and if you're not happy, do not get another iPhone when the future ones come out.
If you feel so strongly, cut your losses and keep on going, after this last replacement i've had, I will not be going back if there is another issue. I'll simply just buy a different phone. Simple.
I have had every single issue verified by a genius, I am not sure your argument is valid in terms of getting a replacement due to the glass, but I would definitely just pay up, like you already did, and just cut your loses. I feel indifferent like you, and if you're not happy, do not get another iPhone when the future ones come out.
If you feel so strongly, cut your losses and keep on going, after this last replacement i've had, I will not be going back if there is another issue. I'll simply just buy a different phone. Simple.