Most people, despite the reliance placed on their mobile phones, likely would say there are times when call quality isn't very good and calls get dropped. Most users of business-grade IP telephony and consumer VoIP might also agree that there are times, especially on multi-party conference calls, when quality also is not good, despite the measures taken to control each discrete set of resources.
Unfortunately, for all the good things that loosely-coupled systems make possible (faster innovation, greater creativity, lower end user prices), one of the downsides is inability to control session quality end-to-end.
The old AT&T monopoly might not have been so good at innovation and pricing (slow innovation and high prices) but it was very good at ensuring high quality.
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