I'm sure for some it's become even more wonderful... but although I "joined" QVC much later than many on here, I would say I've seen a real decline even during my time watching.
It's become narrower, duller, more aggressive, and more arrogant. Alongside that it's become less competitive and their information presented on all platforms is sloppier. Instead of raising their game in the face of more and more sophisticated online retailing, they have sat back on their laurels and repeated statements about the value they offer which no longer stand up well to close scrutiny. It's a shame as to have trustworthy, good value sources of online shopping sources is invaluable for many people who are limited in where they can shop due to illness, disability or carer roles... When I started watching, I was able to discover great brands I'd either never heard of or didn't know much about, and QVC gave me the confidence to try those brands. Nowadays they just don't seem to do that. Their "discoveries" are all either by following zelebs' lives or picking up on the occasional bloggers talent spotting of brands.
It's no longer fun to watch... and far too many presenters who were once a pleasure to watch have degenerated into rude, aggressive, hectoring bores perpetually tethered to an i-pad reading out trivial tweets and twitpix which do nothing to inform any sort of "presentation" of a product that may be happening. It's now become imperative to check the tv guide before switching on QVC for me to avoid nasty surprising when switching on.
QVC now seems to only be interested in the "instant" buyer, rather than the researcher who wants to think about buying later. Previously they seemed to also value those not buying during the next 60 minutes, but no more.