Spoiler
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Hmmmm... ...
I found the final boss fight... anti-climactic. Oh the setup was wonderfully done and everything was there for a memorable fight except for the actual combat itself... ... I fought on Core Difficulty, so I suppose I could increase the difficulty, but considering that this was my first completion of the game, and my second attempt( first attempt ended at the Severed Hand), I was expecting more difficulties from the final conflict. I mean... I had zippo knowledge of what to expect and I still managed to lay the smack down. Heck... I think my hardest fight in the game was when I had fight the Fire Giants with an average party level of 10.
I defeated the final boss with an average party level of 12 by the way. *Sniff* My Mage never got to use his level 7-9 spells, and my Cleric never got to use her level 7 spells. 
On the bright side, credit to the IWD team for the ending which literally made my jaw drop. I so totally did not expect the narrator to be the enemy in the end. Heh, heh... ...
In other news... I need to know this... do Contingencies and Spell Triggers exist in IWD?!?! ARRGGGHHHH!!!! So many good area-of-effect spells that I cannot use them because they are not party friendly!
It is a pain to cast one spell on one target one after another... sometimes I get the feeling I should just create pom-poms for my Mage... The most common combo I use is Greater Malison + Chaos, followed by liberal amounts of Magic Missiles. Effective to a degree yes... but there is no style! ARRGGGHHHH!!!!
Chain Lightning? Oops... Mordenkainen's Force Missiles, cool but the splash effect is nasty to my party... Acid Sphere? Okay, this spell is actually usable as my party members usually have good saves against Polymorph... Burning Shroud? I still suffer the nightmare and remember how my Cleric caught fire while trying to heal those who caught fire... etc... ...