People unfamiliar with the books seem to have a very different idea of what Valyrians are.
The show is about Targaryens fighting for power among each other, and people often root for one of them because the show has failed to portray who we're dealing with.
Valyria was a mashup of the Roman Empire and Nazi Germany: enslaver supremacists who dominated through violence and saw everyone else an inferior and meant to be dominated.
They would send countless slaves to mines where they'd get infested with parasites that would cause them to suffer unimaginable pain before dying. They'd also sacrifice people in bloodmagic rituals to enslave dragons. Yes; they weren't bonding, but instead subjugating the dragons.
Here are a couple of fan representations based on the book:
https://i.imgur.com/bdTYEaw.png
https://i.imgur.com/r61qRbz.png
When characters like Daemon talk about restoring Old Valyria, this is what they're talking about.
Even if she fails to meet the expectations, Daenerys from GoT is meant to be an anti-hero of sorts, so it makes sense that people liked her.
The show has tried to make some of these Targaryen resemble her (even copying her Dothraki hairstyle on Rhaenyra, which makes no sense at all), but many don't seem to realize that they aren't rooting for proto-Daenerys, but instead for Nero.