I personally had the most fun with Mask of the Betrayer by playing a simple fighter with a longsword and enchanting the crap out of my weapons to have an easier time in combat.
Combat is not NWN2's strong suit, and epic level combat is worse. The engine is just so clunky and unresponsive, even on a modern system. I found myself mostly controlling the NPC wizard (to avoid friendly fire, you can't let the AI cast spells. And I hate disabling friendly fire.) and letting my fighter mostly do his own thing in battle.
Mind you, character-building in NWN2 can be fun if you like that kind of thing. Which I do. I had plenty of fun trying to build a party in Storm of Zehir and playing around endlessly with prestige classes and feat lists and dividing skills among my party members. If you know what you're doing you can make a warrior three or four times as powerful as the one I played. But it is bloody complicated, and that's the truth. Since combat in Mask of the Betrayer just isn't very balanced and fun, compared to Storm of Zehir, but the story is much better, I decided not to bother.
Some notes on my build: skills and mental stats do influence the gameplay like they do in Torment. So my fighter had decent INT and WIS (magic items compensated for his lack of hitting power, see the broken enchantment system) and took the Able Learner feat and the Neverwinter Nine prestige class so he could learn skills like Diplomacy. Plenty of other classes would work for this too, like Swashbuckler or Rogue. Neverwinter Nine just suited my character for RP reasons in the OC.
Some notes on the MoTB campaign: yeah, a LOT of enemies at epic levels are immune to sneak attacks, critical hits and Insightful Strike. And MoTB in particular is all about spirits, which are... you guessed it, immune to all that.
There's also a timed mechanic that puts spellcasters at a disadvantage. So the simple fighter has a lot to recommend him. Nothing is immune to Improved Power Attack and a two-handed weapon.
Edit: But as for Swashbuckler feats;
Swashbuckler is a fairly weak class, after the first three levels. It does give you most of the feats you really need automatically, which means you can just focus on the two-weapon fighting ones. Two Weapon Fighting is pretty good in MotB if you enchant your weapons. Ridiculously powerful magic weapon < 2 ridiculously powerful magic weapons.
Blind Fight is always a must at higher levels.
Able Learner saves a lot of headaches if you multiclass.
Expertise leads to Feint which helps with the Swashbuckler's good bluff skill and is quite useful, especially when you multiclass to Rogue... except for that bit about everybody being immune to sneak attacks.
Knockdown is much less useful than it was in NWN1.
Improved Critical is of course pretty good, particularly if you dual-wield two weapons of the same type... except for half your foes being immune to crits.
Power Attack/Improved Power Attack/Cleave are only really good with 2-handed weapons
Weapon Focus/Epic Prowess/Armor Skin(epic)/Saving-throw boosting feats are never -bad- picks. Just not very inspiring either.
Luck of Heroes is always a good choice at first level. It's better than most Epic feats. But you get it for free at level 11.
But considering that there are 5 pre-epic two-weapon fighting feats and you get 7-8 pre-epic feats... you should probably just stick with the top few picks here.
Post edited June 15, 2014 by Jason_the_Iguana