Spoilers ahead, if anyone cares. Spoiler: you shouldn't.
The three primary male characters in this series are Rand, Mat, and Perrin.
In the TV show, Rand is dating and fucking Egwene. Mat comes from a broken home with a lecherous and alcoholic father. Perrin is married, and he accidentally slaughters his wife in the very first episode.
None of this happens in the books.
Rand and Egwene seem like a thing initially, but it never happens. Mat's dad is a stand-up dude and a pillar of the community. Perrin is very single and doesn't accidentally murder anyone.
Let's summarize the changes:
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Rand goes from having no physical relationship with Egwene to fucking her in the first episode
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Mat's father goes from good and decent member of the community to drunken adulterer
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Perrin is given a fucking wife out of nowhere, and he accidentally kills her for cheap effect
I've never seen such radical, unnecessary, and terrible changes to a beloved series. I've also never seen the sheer cope I witnessed when surveying the WoT communities online. People are glossing over these massive, character-wrecking alterations like they're somehow part and parcel for adapting anything to TV/film. No, retards, this is not normal. This is fucked.
Brandon Sanderson, the dude who finished writing the books after Robert Jordan died, is on record saying that he tried to fight these changes, and that the fans would be upset about them. He of course moderated his position because you can't burn any bridges in the industry - especially not when you've got a whole bunch of your own books you'd like to see adapted. But even with his tacit permission to hate this nonsense, people are still posting about how they cried when they finally saw their favorite books on TV.
I'm rambling. I knew it would be bad. But Jesus Christ, I never expected it to be this flagrantly disrespectful. Robert Jordan is turning over in his grave.
I didn't even think about the changes to the one power and the prophecy. Is the dragon reborn only a threat to the world if he's reborn as a male?
Personally, at this point, I hope it is Egwene. That'd be the icing on this cake.
Would cause so many fuckups throughout the book given what happens to Rand because he's the Dragon and what happens to Egwene because she's a pissy brat. The fact they're on completely different battlefields at the very end being one of the bigger ones.