Crit isn't super-useless on Lee like Thorns seems to be implying but it doesn't affect much of his damage, which comes from spells. Contrast to GP, who applies crit to almost 100% of his damage output, and the implication is obvious. That said, the fact that Atma's lost AD value roughly equivalent to the crit that remains on it... well, it used to be worth it even on champions that crit was relatively useless. At least crit is never entirely useless on AD champions, unlike say mana/regen on manaless champions. (Which doesn't stop Lich Bane from being awesome on Akali or change the fact that DFG was nerfed even for champions that didn't use the mana regen.) But Atma's is weak enough now that it's a questionable endgame item even for the Gangplanks of the world, you're probably better off just getting more pure tank-oriented items and then IE for your damage.
6/27/11 never forget akali :(