Hmm... one of the ideas that I always asked in the old discussions was "Would the party be better off, with another class in this slot instead." a lot of time the answer was and overwhelming "yes"...
I don't wanna seem like I'm moving the goal post here... and I'm not trying mind you but, the 75dpr per full attack thing is in a bubble, but honestly we honestly don't calculate anything else that might be being done besides damage. . . tripping, stunning, dazing, nausea, karmic striking, attacks via manuever, deny opposing full attacks, via moving out of range, or some form combination of ac & miss chance or whatever. The idea is that the Pc's get this thing and a Fire Giant wouldn't have that. What the fire giant has is immense strength and more hitdice, and a pool of hp.
Ultimately, basketburner is right about a LOT of what he's saying
Because...
even BESIDES all that "potential" the spread of enemies are really brutal for the fighter.
Animated Object, Colossal
Brass Dragon, Young adult Large Dragon (Fire)
Couatl Large Outsider (Native)
Cryohydra, Nine-Headed Huge Magical Beast (Cold)
Demon, Bebilith Huge Outsider (Chaotic, Extraplanar, Evil)
Formian Myrmarch Large Outsider (Lawful, Extraplanar)
Giant, Fire Large Giant (Fire)
Golem, Clay Large Construct
Hydra, Eleven-Headed Huge Magical Beast
Monstrous Scorpion, Gargantuan Vermin
Naga, Guardian Large Aberration
Pyrohydra, Nine-Headed Huge Magical Beast (Fire)
Rakshasa Medium Outsider (Native)
Red Dragon, Juvenile Large Dragon (Fire)
Salamander, Noble Large Outsider (Extraplanar, Fire)
Silver Dragon, Juvenile Large Dragon (Cold)
White Dragon, Adult Large Dragon (Cold)
So... back to the begining
What is the fighters (melee guy) role in those fights?
From where I'm sitting the melee guy isn't the one who answers any of those questions.
Its the FC (Full Caster) that answers those questions/threats, if those questions are to be answered at all.
I have to yield the DPR arguement, I guess. The challenges there, that are melee's are too hard core for a fighter to melee, the ones that are casters... don't "HAVE" to confront him in melee at all, unless the melee has some highly specialized detection and damamge delivery system.
Those are the fights. Only high suffiecently optimized melee builds need apply, those that are can either kill in 1 round or incapacitate for multiple rounds, because the monsters are doing just that. Or rather, they don't have to kill you but once, when the monster kills the fighter and dies to the rest of party... there's always another monster.