Yea, I get about 16-20 fps with 16x AA with max shadows + lighting @ 1900x1080 at the crystal in Gridania. I mean it's playable but anything below 40fps just doesn't feel fluid to me.
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For me, anything below the refresh of my monitor is what I consider not reasonable (ie. 60fps). 40fps and below is absolutely unplayable for me, I just can't stand it. With a GTX680 at 1440p I can maintain 60fps with VSync about 95% of the time. FATEs tend to drop to the 50's.