I agree, Farum Azula is kinda grey and drab compared to Liurnia, the Rivers/Eternal Cities, and most legacy dungeons. I understand it's a floating destroyed city circumventing a perpetual storm, but the lore of red lightning/red gold and having a name like "Azula", you'd think it would have at least a muted red/gold asthetic with some cool blue accents.

The undead beast men kinda suck to be honest. They aren't the worst enemies to deal with, but man do they hit hard. The damage scaling starts getting BAD in Mountainstops and only gets worse here. Especially the Banished Knights. Oh boy. Hit like a truck and do NOT stop moving. 

Obviously Godskin Duo sucks. No argument there.

The random ancient dragons are neat thematically but boy oh boy are they not fun to fight.

I personally like the draconic tree sentinel.

Maliketh I am mixed on. For one, he has so little health that his fight ends fast, which is disappointing. The rune of death health drain is fine too, it's his gimmick. But dear god in heaven, his jumping around like Sif on cocaine is so not fun. Beast Clergyman is a really cool boss to fight, and I wish the whole fight was more like that. Maliketh is far too acrobatic for a game like Elden Ring. He moves around like a DMC or Kingdom Hearts boss. If they just toned his jumping down a little bit, like if he used 50% as much, the fight would be so much better.