This thread is dedicated to the numerous instances of contradictory rules that have managed to plague this system for the past 7 or so years. I'll start:
Far Shot: A feat that doubles the range of any ranged weapon you wield. It's requirements? A feat that requires you to be within 30ft of the target to use. FYI, a majority of the thrown weapons have a range increment of 20ft after the application of the Far Shot feat, but when you add in the Distance quality, PrC abilities, and other effects that improve a ranged weapon's range increments, and the prerequisite feat becomes largely counter-intuitive to what you are doing.
Plus, how much sense does it make fluff-wise? In order to take a feat that doubles my range, I need a feat that only works up close...
Weapon Finesse: A famous one, but fairly easy to overlook. Power Attack requires a Str of 13, but functions off of your BAB. Weapon Finesse is the exact opposite; it requires a BAB of +1, but makes use of your Dex score. Shouldn't this be the other way around? As-is, a 1st level Rogue cannot take Weapon Finesse even if his Dex score is 20. That's an entire level of him being forced to use a dump-stat to make attack rolls. meanwhile, the Barbarian is allowed to take advantage of the Power Attack feat he took. Not very fair, IMO. I know many DMs allow you to ignore the BAB+1 requirement on Weapon Finesse, but that's not the point of this thread.
Die-Hard: This one never made sense to me. Why does Die Hard require the Endurance feat instead of something like Toughness or Great Fortitude (both of which make marginally more sense)?
More importantly, why did this feat get outclassed so easily? A PrC (Frenzied Berserker) class feature does it's job better (and IIRC, FB doesn't require Die-Hard to enter), and later in 3.5's life we ended up getting both Shape Soulmeld (Rage Claws) and the Stance of Immortal Fortitude. One of those kicks ass, the other one is practical.
Oh, and Crusaders do not get Die-Hard at 13th level. They get a useless class feature that says they get Die-Hard as a feat, but it says nothing about meeting the requirements for it. By RAW, this means they have to take Endurance just to use one of their class features. Annoying, eh?