This update was my least favourite. Let me explain.
I think it ruined not only the nether, but the survival story. Nether fortresses are now an irrelevant part of minecraft, it's now bAsTiOnS. And the new nether mobs are all wierd, with a few exceptions.
I hated the biomes. The soul sand valley and basalt deltas were cool, but the forests? Ew. The warped forest was really bad. Enndermen shouldnt be in the nether, they should be in the end. And the crimson forest was also really weird.
Netherrite. WHY DOES THIS EXIST. minecraft, what have you done. You have created something better than diamond. Why did you do that. Diamond rarity was classic minecraft. WHYYYYYY
I however do think this update had some cool parts, here they are...
Bartering and piglins (better than zombie pigmen)
Less ghasts (they were so annoying)
Basalt deltas and soul sand valley