The Samurai changes in 6.1 have made me not want to play the job.
I don't think I've ever posted in the official forums before, but the devs asked for feedback and I'd like to add my voice to the cacophony. In short, I am very unhappy with the removal of Hissatsu: Kaiten and some of the other changes in 6.1. So, point by point:
Hissatsu: Kaiten and the Kenki Gauge
The main sticking point for me is Kaiten, and I have two problems with its removal. The first is that it simply felt good to use; winding up for a big strike fulfilled the job fantasy of samurai for me. The second is that I now dislike the kenki gauge in its entirety; Shinten is the most boring ability samurai has, and the other kenki spenders' cooldowns line up perfectly with Ikishoten, negating any sort of gauge mangement requirements.
If Kaiten remains gone, I would rather see the complete removal of the kenki gauge. If a kenki spender must be removed, I would prefer to keep Kaiten and remove Shinten. It would be neat to play around using Kaiten on some combo finishers rather than just Iaijutsu.
Tenka Goken
The second problem I have is the circle aoe on Tenka Goken. Because the animation wasn't designed with a circle in mind, it loses the visual impact and satisfaction. I don't like that samurai now has to manage a cast time in the middle of a dungeon pack, and I don't like that in dungeons a samurai is best off just standing directly on top of the tank. Personally, I'd prefer if all of samurai's aoe were cones, but I understand that I may be in the minority with that.
I'm also unhappy with the way the potency numbers behave, which is related to the removal of Kaiten. Spending the sen gained from samurai's aoe combo on Hagakure instead of Tenka Goken, unless Tsubame Gaeshi is available, is only slightly less damaging. That difference is made up for the moment a samurai has to move and cancel a Tenka Goken cast.
Potency Changes
This is a minor issue for me, but the current potencies leave Midare Setsugekka at barely more damage than a direct crit from a combo finisher. Don't like that.
Auto-Crits
I understand this one and don't mind always getting the big hits on Iaijutsu, I enjoy warrior as much as ever, but it's important that they actually feel like crits.
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Hopefully that's useful feedback. I'm a relatively casual player who's been with the game since about 2.2ish, I don't step much further than Extremes due to not having the groups to play with. I like to have one job from each role to main, and samurai was my main melee dps. As it is now, I don't think I have a main melee dps any more.