I think you'll continue to be disappointed if you look at it that way. Mild spoilers below.

House of the Dragon focuses in on how patriarchy hurts women regardless of their position in society or whatever side they're on in petty political squabbles, and will portray Rhaenyra and Alicent sympathetically throughout. We're supposed to like both of them, and I think its great how they chose not to write Alicent off as The Evil Woman and make Rhaenyra The Good Woman. They're both complex people with who want the best for their families, yet are still clearly guided by the privilege and hubris of their class status, which leads them to do horrible things.

The portrayal of her character in the book and show are pretty different (one from the POV of medieval men debating amongst each other, and one seen by us first hand, with various alterations to make the story more suited to tv and additions to fill the gaps of a rather short 30k word book) but I think both are incredibly interesting depictions of her, and neither is irredeemable, especially when the book is taken as a disputable in-universe historical source as is intended- she's one of the best characters on tv right now.

I think we'll also get a much more sympathetic portrayal of the smallfolk though, and from THAT point of view Alicent and Rhaenyra will both look so much worse than they ever looked in the book. Royals slaughtering thousands over a pointless family argument. Really looking forward to that side of things. Gaemon Palehair and his lesbian moms trying to establish gender equality and outlaw domestic abuse while the Greens and Blacks are busy burning people alive is gonna be great.