PS : I have completed BG1 with a solo Sorc, if i can't play the BG module or IWD module in nwn2, is because nwn2 is broken. If i can't with PnP spells, i will play other game.
Sorry but just NO!
Not being able to complete NWN2 with a solo sorcerer on Max difficulty, is NOT
a sign the game is broken.
It's a sign that the game is intended to be played with a full party
. Which works just fine if you leave off your mods which are messing it up.
Classes are NOT intended to be balanced against each other, they are intended to cooperate with overlapping strengths and weaknesses.
Why do you think they went through all the trouble of Adding Full Party Control to NWN2? It was so players that like micromanaging battles can get their fill.
NWN1 = Single character + sidekick.
NWN2 = Full party, with full party control, which necessitates greater difficulty in modules.
TLDR: You are breaking the game, then complaining it is broken. The game is fine. This is almost entirely a PEBCAK issue.
Even for full party. Compare the usefullness of a sorc with the usefullness with a druid or a cleric. A sorc = one less character in party. The fact that you can complete the game with a max party size - 1 doesn't means that a sorc as MC is viable. Means that all other classes that you are using are viable.
Divine casters have a better BAB progresssion, better spells(since they removed a lot of good spells like time stop and nerfed others to oblivion), better companion(compare a Dinossaur or a epic dragon with a useless mudcrab), better hit dice, better AC, can cast spells in armor... IF SORCERERS AREN'T BROKEN IN PNP, THEY AREN'T BROKEN WITH A MOD THAT PUT PNP SPELLS.
I an not using a single mod that gives caster more power than they already have in DnD pnp. To be honest, considerind that you are dispeled from your defensive spells after cutscenes, even with mods thats fixes the spells, divine casters still much better than arcane casters.
Arcane casters aren't OP in PNP D&D, BG1, BG2, IWD1, IWD2, NWN1, are simple viable because they are more close to pnp;(divine casters still more powerful even in nwn1);;; I have no reason to pick a arcane caster over a divine caster in nwn2
. hit dice? d4 vs d8, ignoring the feats and the CON, a divine caster have 2x more HP than a arcane caster of the same level. BAB progression = low VS med, OHK spells? +3 on save from spells like Implosion, AOE spells? Druids rocks. Single target DPS? Cleric Rocks. Companion/Familiar? Druid can have a dynossaur and a epic dragon, while sorc/wiz have only non combat familiar. AC? Divine casters can use armor and feats like divine shield(...) There are nothing that a arcane caster can do in nwn2 that a divine caster can't do better protected by a armor.
Is possible to have more AC than fighters due feats like Divine Shield and spells to buff AC.
I have played nwn2 with both. A arcane and a divine caster and can say by my experience. Arcane casters usefull as a rock that die in one round and takes party slots. Of course, you can win with other party members, but a cleric or a druid is much more usefull. Will do more damage to enemies, will have a better companion, better AC, better 2x more hit dice...