to be clear about NWN2 vs NWN1
All what you can do in NWN1 can be done in NWN2, NWN2 also allow far more things, with more powerfull scripting (added functions) better conversation scripting, and allow cool cutscene. Area creation is far more powerfull in NWN2 than in NWN1, beeing with tilset or mapped terrain.
Lexicon is a good thing, but even if you can' t find a cool NWN2 lexicon, NWN1 Lexicon is good enought to get started, all NWN1 functions are functionnal in NWN2.
Now NWN2 still remain very close to NWN1 at its core, which mean it 's not possible to do a multi layer area with passage above and under, it 's still a plane, a deformed plane, but remain a plane, just like almost all Bioware game until now (with the exception of Mass Effect 123 and SWTOR). It also remain a turn by turn combat just like NWN1 and infinity engine game, so no fast reacting skill or fast twitch gameplay like you can have in a good MMO, H&S, or MOBA. you have a set action and they can be altered within the combat round rules, just like NWN1 which mean it 's limited.
There is no coming and start contreversial thread trying to prove NWN1 is better than NWN2 by asking "functionnality" that might exist in NWN1 but not in NWN2.
NWN2 is an improvement, everything from NWN1 carried over in NWN2, and more thing were added.
Everything you have seen in NWN1 can be done in NWN2, and NWN2 allow more. Now NWN2 doesn 't allow all what we wants it still has serious limitations, many things are missing, but today it still remain the most powerfull toolset given to the public for making a game/module wich isn 't based on a solo character, and it s a far more powerfull toolset than the NWN1 one even if you focus only on one character.
That power came at a price, NWN2 toolset is harder to get into than the NWN1 one, but it 's not that diffilcut, someone with a good experience with NWN1 should quickly get into NWN2 toolset without much troubles.
Also many of the bugs poeple compalined about NWN2, were "modules bugs", which mean the toolset or the game weren 't at fault, most of it were "scripting bugs", and for having replayed NWN1 recently I can say that today NWN1 campaigns have a lot of those troubles, more than NWN2.
Trying to prove NWN1 is superior to NWN2 is stupid, the NWN1 and NWN2 players/modders are only on those 2 games beceause they still have no real successor, as soon as a worthy successor will comes out, those 2 games community will be greatly dismished.
Instead of trying to "fight NWN2" you should rather enjoy it, many modder /scripter remain only beceause of NWN2, and since the scripting between NWN1/NWN2 shares a lot, it gives you more opportunity to get help when you are stuck even if you only script for NWN1.