Number 1
1. Log into the game
2. Press J
3. Go to the last tab called Leaderboards
4. Pick the top players of each class in the most active campaign
5. Press the Trials button
6. Pick the top players
7. Ask whats wrong/bugged with a class
8. Take the answers into consideration
9. Do a correct fix
10. ???
11. People still rage quit
But in all seriousness let me give you an example of what could have happened.
You could have asked the top players, maybe 20 people in total, ask them some questions about the Nightblades and Dragonknights. They would have told you that there is a Nightblade in their party right now that pulls 1.1k DPS (Yes, I know two guys who did that before the buffs). And that the issue were that weapons were nerfed/staves were buffed and that only buffing NB would be necessary.
You wouldn't have to screw over every other class by nerfing crit ultimate from 3 to 1.
No healers in trials were using Force Siphon, it was purely an ultimate builder so I will give you that one. But removing ultimate from it completely without buffing it at least or something wasn't good.
There is so many scenarios which would have been avoided if you guys asked advice from the people who do the actual theorycrafting, who spends their days trying to figure out the ultimate DPS build. Instead of listening to the masses who did not spend a single second figuring out how to min max. Who just goes with their build for Roleplaying value or some other reason.
Right now, you guys are terrible at fixing, if this is your way to slightly nerf a class slowly step by step then you are doing what you said you werent. Youre nerfing classes to oblivion.