Archaic mechanics in Maple.

Buccaneers and the death count system (especially on Magnus). For a class that needs to line up all its hypers, buffs, and its proc to do decent damage, its really hard to do this on bosses that can 1 or 2 shot you. Plus dying early on in stimulate cuts it off, ruining damage output. Their solution to this outdated mechanic is "buff freezers", but that sounds like more of a cash grab than a serious solution.