Does anyone else think call quality sucks?

I guess this is a half rant/half poll.

I have an iPhone 5s (AT&T), and most people I talk to on the phone have iPhones, but even when I call a landline, I feel like call quality is just terrible. I think the few times I've used FaceTime Audio have been incredibly clear and have made me realize just how bad regular calls are, but I've only used it over Wifi.

Can we expect this to get any better soon? Will voice over LTE make this better?

Just want to know if I'm the only one who finds this incredibly frustrating