Exactly as the title said, his little bats constantly get in the way and damage you if you aren't careful enough. Not only that but his ice phase is just annoying and a time waster. Maybe i'm just bad at fighting him, but all my friends seem to agree. He needs a rework imo.
We definitely have heard the feedback that our icy boy isn't an encounter that players love yet. We have some changes we're testing internally that will hopefully make fighting him more fun -- I'd expect to see them in a patch or two.