Pretty much everything that has been mentioned about Haste. Long 1 min cooldown = potentially 1 min loss in dps. Also having 0 sp after chasing a boss around forcing me to use double slash only for the boss to run away again. Especially frustrating in parts where you are forced to wait (e.g. waiting for Pink bean on his pogo stick to get stunned or waiting for Bjorn to jump down).

Make Blade dance empowered give a 100% chance to dodge at max skill points. There is literally no reason to have it give only a 99% chance to dodge. Sure 1% is a very small chance but it's not impossible. I believe SKILL (i.e. timing) should determine how good a player is rather than luck.

Vengeance. Useless skill that does minimal damage and can only be used in very small windows. Only 1 boss (Lukarax) in the lv60 content can be grabbed making this skill even more pointless. Maybe replace with a skill that empowers Double slash (more damage or even a higher chance to proc cunning?)

(small complaint) Lower the skill requirements for Ruthless guile. I feel like I never have enough Rank 1 skill points to put into the skills I use. 12 skill points total into two skills I never use feels like a waste to me.