In my opinion, the best feats so far are the ones where you think: "Wow, that's way overpowered", then "Wait, a Sorcerer could do that, and a couple levels earlier", then "Huh, maybe that would work".
It's been a fascinating tour of my own "fighters can't have nice things" biases. Well, and that bias inherent in 3.x core, since even Epic Feats for melee are generally not as powerful as things in this thread that seem increasingly reasonable.