Mind Blast was fine with 1 card like Shadow Visions. You can’t leave Mind Blast in the game if you give Priest 30 ways to discover spells.
Support for Shadow Visions is coming this year according to the devs.

The hate toward Priest is not random and isn’t a trend it comes from designing a class that wins by out valuing control decks with random spells, out healing aggro decks and disrupting combo and control decks. And Priest can do all three in the same deck and very well.
It’s also very strong, look at the last Master Tour everybody brings and ban Priest.

Priest still see plays so some people probably enjoy it. However, the class is hated by a huge part of the player base. People who used to like Priest (like me) hate the class now. Top players still play the class because it’s good but they don’t enjoy it and hate playing against it.

Check this thread by Feno it’s pretty damning: https://twitter.com/FenoHS/status/1406693367963074560
Even Zetalot isn’t happy with the class.

I agree with most of them. Ice Block (non-interaction) and Bloodbloom (mana-cheating) are also good examples of badly design cards.
I like Highlander decks though, because of the singleton restriction you’re not always playing the same cards but some of the payoff cards are too strong.