Collusion is definitely a lot weaker than it used to be, but you should try using it with a monk using Howling fist rather than "whenever you see them doing a weapon skill".

Monk weapon skills range from 400-1800+ so obviously howling fist is going to be a lot better. But it feels like Collusion is much lower than 50% of the threat from the attack now, which is a shame because whether you think WAR "should" be a boss tank or not effective hate transfer is a nice addition to party mechanics that is now once again lacking in FFXIV.

Can we get a real trick attack like ability already?