Does the world really need a grimdark version of Anne of Green Gables?? I doubt it. There is definitely darkness in the text of the book -- I won't deny that -- but to put Anne in a literal fugue state when rejected (instead of having her say "this is the most tragical thing that ever happened" or whatever it was that she actually said) is to rewrite her character completely.
Yeah, not all fan fiction is good fan fiction -- even when it's the official kind that shows up on television. Or Netflix.
Full disclosure: I adapted Anne of Green Gables to a one act stage play when I was 12, though, so maybe I'm too fond of the source material to be fair about this. I also re-read all seven of the original books within the last couple of years (mega props to Rilla of Ingleside -- a forgotten gem), and I can say that they definitely still hold up. There's quite a lot of darkness in those books (abuse, dead babies, literal war), but the darkness isn't the point. Also some fairly weird shade against Methodists? Yeah. No idea what that was about.
Anyway, I doubt I'll watch the series, but mostly because I don't care enough to see if I hate it or not.