Bear did say that Barong's annoying, and he did specify that annoying doesn't necessarily mean hard. It seems to more describe the tendency/capability of a boss to drag things out if you can't burn it down right away. Like Reiki's constantly re-applying def buff to itself when raging. Or Barong here wiping debuffs constantly and whittling your party down.
IIRC, he also mentioned Amaru (the raid after the next raid, Tiamat) as another annoying one. And you know what, glancing at her page on the wiki, yea, Amaru does seem pretty annoying if you can't win quickly.