Category:Character builds - NWN2Wiki, the Neverwinter Nights 2 wiki
Notice that most that use fighters do not go past 12 levels..
Thats because they stop once they have Greater Weapon Specialization (which allows for Epic Weapon Specialization).
Of course the one thing Fighters are supremely good at is accumulating FEATS!

(..should be called a FEATer.

)
Dual weapons *can* be better in this game than NWN(1). The reason is that you can enchant weapons with various damage modifiers.. and particularly MULTIPLES of damage modifiers at higher character levels, and that with the extra attacks (should they actually *hit*) will increase the overall damage.
On the other "hand" Two-handed weapons can get a LOT better with Improved Power attack and 5 or 10 levels Frenzied Barbarian. (..not necessarily better than a dual weapon character, just a LOT better than NWN (1).)
Finally, a Cleric or Favored Soul can cast the spell Divine Power and achieve the same BAB as a Fighter of the same character level (..though it is time limited and not available for persistent spell inclusion.)
CAUTION:
Two-Weapon Feats are Dexterity sensitive and effectivly REQUIRE that you use a *light* weapon in your off hand (preferably a Kukri):
Two-Weapon Fighting - NWN2Wiki, the Neverwinter Nights 2 wiki Improved Two-Weapon Fighting - NWN2Wiki, the Neverwinter Nights 2 wiki Greater Two-Weapon Fighting - NWN2Wiki, the Neverwinter Nights 2 wiki Perfect Two-Weapon Fighting - NWN2Wiki, the Neverwinter Nights 2 wiki
Note that only a Two-Weapon Ranger can "get around" the Dexterity requirement.
Considering the number of attacks vs. the penalty and actually being able to *hit* opponents with those attacks - you should either:
Go for a Ranger to level 21, OR
Stop at Improved Two-Weapon Fighting (..and if you do this then STRONGLY consider the two-handed weapon approach instead), OR
Plan on spending a LOT of your epic feats on Dexterity points.
Also, instead of a bastard sword, consider a Kukri for BOTH hands - this will give you the Weapon Specialization feat bonus damage for BOTH weapons that will eventually out perform a Bastard Sword in your primary hand and a Kukri in your off-hand.