I feel that most people who speak very badly or very well about NFTs and crypto in general don't really understand it.
In simple terms what the Blockchain technology solves is a way to have an append only database with no centralized authority. This is a HUGE accomplishment, but you very likely don't care about it.
In short, this means that Blockchain provides a way to exchange "tokens" without any user needing to trust each other or a third party. If you can trust the other person, or can trust a third party to be impartial then you don't really need a Blockchain.
A Token is a representation of something, for currencies a token is a representation of value, and value is a fungible attribute, I.e. 1 of them is the same as any other, like coins, where you can replace a coin for another of the same denomination and they're worth the same.
However tokens can be non-fungible, which means that one token is not the same as another, think for example house deeds, if someone takes your house deed they can't just give you a different house deed and be the same.
We use non-fungible tokens a lot on our society, some examples are steam keys, vehicle registrations, or certifications of ownership for expensive pieces of art. We usually can trust valve, the government and whoever issued the art certificate to be impartial when someone tries to sell a game, car or art. But what if you couldn't? How would you safely validate ownership without having to trust anyone?
That's what crypto NFT bring to the table, someone had the idea to create a platform where artists could create tokens of authenticity for their art, and sell that to people giving them a way to own digital art in the same way that someone owns a painting. Then crypto bros started pumping that to sell their tokens for a higher price and a lots of people fell for it and started buying tokens representing ownership of things they didn't wanted or understood to try to sell for s higher price later.
Obviously that scheme fell, but that doesn't mean the technology is useless or untrustworthy. But for most cases crypto is not needed as most people can trust their government or some other centralized authority.