Brayflox (NM) earned its "hard" reputation because of how things were during the first few months during release.

Almost everyone was in NQ ~i30 gear when first attempting the dungeon. (Now a group is likely to be mostly level synced or wearing HQ or the dungeon's Greens)

Aiatar is the first boss with a fast "must dodge" AoE. (If you are practiced in dodging HM and EX Landslides you are practiced in dodging his breath.)