I guess I don't like Raul. I think he's a huge whiner. It's like... come on man. You're 200 years old. Get your shit together.
> see the nuclear holocaust on the spot
> watch your family burn to death
> live in the irradiated rubble of Mexico City
> turn into a ghoul
> find your sister's mutilated, barely recognizable body
> live the next century in a world filled with savage violence
> live through yet another situation where you can't save a girl
> moar violence
> get locked up by a schizophrenic nightkin
> feel the old age catch up to you
IMO Raul is in a pretty decent psychological state, given what he has been through. He should be a wreck, yet he's still surprisingly witty and funny (maybe that's his way of dealing with internal issues, though). Also, he just feels less useful in his age, but wants to change something in that matter, instead of laying down and waiting to die. So you could say at the end of his quest he does get his shit together. Raul is one of my favourite companions, so just adding my two cents here.