I like skill speed for MNK, once you get 495 you have the 2 second GCD, and at that point you can macro your rotation using the <wait.2>

Also with 2 second GCD it works out you get more attacks in before having to refresh dots, more attacks for Perfect Balance and Internal Release. Because of Bootshine 100% crit rate and Internal Release +30% every min for 15 sec (25% up time) I think if you can get 495 skill speed it works out better than Crit.

I would agree however that anything above 495 is wasted (I currently am a little over but nothing better to replace the gear with yet)