Which fights were difficult aside from the obviously broken AV/PW? Abyssea gets bashed a lot (mainly because it went crazy with 3x Atma) but the enemies in there were actually mechanical. Briareus/Cuelebre/Micua... Serpentes Gloves NM for instance from the first three Abyssea zones all had interesting mechanics, especially done lowman. Lowman RDM on things like Cuelebre/Mict without Atma was a very refreshing challenge for XI. Abyssea only became easy when they overdid the Atma/buff thing.