I can't imagine it'll be all that good. The thing that really pushes Buffy to "cult classic" status is honestly 90s nostalgia. I can't imagine a version of Buffy that isn't heavily steeped in 90s cliches.
I mean it has some howler episodes but so do a lot of shows. It's fun, interesting, engaging and full of likeable characters. I can think of a lot worse 90s shows.
As a Buffy fan I'm quite excited. But sarah michelle gellar is just not a drawcard for me. What's to be excited about? She played the least interesting character and did a mostly adequate job of it.
I thought that from S5, after her mom and then she died, that it was the best part of the series. It stopped being as campy and showed much more character growth all around.