I meant that you can't use Intelligence on a Fighter in NwN as your primary combat stat--attack and damage are Strength unless you take Weapon Finesse, but melee damage is ALWAYS strength based. In DDO there are specialized weapons and abilities that you can get on different classes and races that actually let you make Dex, Int, Wis, Con, or Cha your *primary* combat stat. It makes for some REALLY fascinating trade-offs. For instance, you can make a dwarven character who can use their Con for damage with either axes or hammers (even throwing axes/hammers IIRC), leading to the ability to stack your Con to the SKY and still do good damage, so a dwarf can have MONSTER HP that no other DPS character can touch without nerfing their damage. It's REALLY cool.
That sounds like a terrible idea. I need lore-based explanations for mechanics; they'd need a pretty big one to explain how Constitution influences my attack and damage modifiers.
Also, on NWN, yes, you couldn't have Intelligence affect your damage, but you could have it affect your effectiveness. Not all fighters are built around doing damage, and nor should they be.
My primary objection to enforcing combat roles based on class is that it ends up making all Fighters the same, and a Fighter should really just be someone who'se primary vocation is fighting. But there are lots of different ways to fight.