15 fort difficult? bhahahahahahahaha, 15 fort is easy to get, but yes Paladins get it lower, but at around 10-13 levels they are about the same save wise
I doubt that... after all the pally can take Save feats too. I think it really starts getting closer once they hit the 14+ mark and the Fighter starts investing in enchanted gear.
Yeah, usually paladins can eventually have at least Great Fortitude, possibly Luck of Heroes too. They tend to have lower constitution which evens their unbuffed fortitude a little, and at least my paladin really can't ever get enchanted gear since the dialogue is so morally ambiguous and he's too uptight to trade with suspicious people to get +1 universal saving ring, so most fighters of his level actually have more fortitude and reflex. One barbarian, when geared up, even has more will.
But back to rogues, I too have to say that when you can get the items and resources you need, there's no much difficulty in being a help to the party in a dungeon of undead.