I recently asked whether it's possible to count as evil to qualify for feats. The only answer so far is that having the [Evil] subtype makes you count as evil (in addition to your normal alignment) for "effects" that depend on alignment.
Does a feat count as an effect?
I'm inclined to say "yes", because they are ultimately not that different from spells and similar (especially spells like polymorph any object/baleful polymorph which create a permanent physical change). Are there differences? Of course, but there are also differences between spell effects, supernatural ability effects, and environmental effects like being on fire. The differences are mostly in duration and end conditions (and trigger conditions, but those vary wildly). Feats are permanent (as are many effects) and are ended if the character with the feat no longer meats the prerequisites (rather like how Inspire Courage, for example, ends if you're no longer within 30ft of the Bard, or how Smite Evil fails if the target isn't Evil).