Curious...
Do the pavers get grouted in like the coping? Not that that would matter. Looks to clearly be unacceptable workmanship.
I can't add much, except moral support, and additional venting. I just can't wrap my head around stuff like this. And I always wonder about what was going on in the mind of the guy that left that work and considered it done. Does he honestly think that's good enough, that it meets some reasonable definition of adequate? Broken and missing corners? Crooked cuts? Uneven seams? Ragged cuts? Rocking pavers? Really? (Geez, the Romans did better work than that, about 2000 years ago! Pretty sure they didn't have any power saws with diamond blades! Or does he know it's not good enough but doesn't care? Or maybe he's hoping that you won't notice? Or hoping that if you do notice you won't call him out on it? So that, to him, the definition of "good enough" is what he can get away with without having to redo it?
Is pride in your work something you inherently have, that you're born with? Or something you're taught? The latter I suppose. And it's no longer being taught as well as it once was, that's for sure.
In my trade, my end product is perfect, or as close to perfect as I can possibly get. Even knowing no one will actually notice that it is, and that I could have made a little more money by doing less. But it makes me feel good to know that it is perfect. And (likely because of my OCD tendencies), I get physically/emotionally uncomfortable when I see flaws in workmanship, so I can't really let stuff like that go even if I wanted to.
I get it that not everyone is going to provide that level of quality, but surely there must be some line that shouldn't be crossed. Some crooked paver line, for example!! Like Kim said: stick to your guns. We're with you!!