I beg to differ:
http://raidbots.com/epeenbot/us/mal'ganis/clamlapper/
25 Heroic:
Feng - 39th
Garajal - 30th
Elegon - 28th
Those are your best of the best ranks for your parses. The rest are garbage. Sure, some strats dictate you will be lower, no biggie.
Haste is essential for Chi generation, and smoothing out the playstyle.
Crit is essential for maintaining higher elusive brew uptimes.
The general rule: Haste until you feel comfortable. If 4500 with Ascension/Power strikes is enough. Great, move to Crit. If 2k is enough (it isn't, but whatever) then fine. If 9k, same thing. But once you find your mark, put it into Crit. You will be amazed at how good it feels, how much nicer it is to avoid attacks completely, and your healers will rave. I personally love watching Thrash miss all 3 shots, and Dread Thrash missing 5 of 6.