The answer is: they are both are (unless of course, the paper cup is a failed crystal glass – or vice versa!)

The paper cup was meant to be a paper cup. The crystal glass was meant to be a crystal glass. They were both meant to be like that. You might like one better in some circumstances than the other (entertaining guests, for example), but on other occasions you might prefer the other (walking in the hills, for example).

So quality  fundamentally lies in the product or service specification: it is nothing to do with any individual’s personal taste (though of course – vitally – the customer’s preferences should be built into, and shape the specification).