The problem with "Instant OFF GCD" abilities makes combat feel less rewarding.

[Jinko]

It's caused by not allowing you to overwrite animations with another, and we know exactly why the AoE latency is happening and how to fix it. It's because the server checks your position every 0.3 seconds and needs to be lowered to 0.1.

I don't think is effected by animation, sometimes I can whip through my cooldowns really fast but other times they will be held back by latency and in some cases the cooldown animation will play and the skill won't take effect, a second later the skill has reset.
(I'm pretty sure this is because the client is saying yes you can use that skill, and the server is saying no you can't)

Fact is neither of those things ill be fixed, and I still think 100ms is too high.

I'd be interested to know what WoW uses for position checks, cause that is what they should be aiming for.