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After several hours of gameplay I've not found a single occurrence where if you shut a door in the enemy's face they will open the door and chase you. Also if you move inside/outside of a building there's a 50-50% chance that they will not follow. This is in contrast to the original game where enemy characters would act more intelligently and open doors and follow you and it certainly lowers the difficulty.
Flaws in the original AI behaviour have been maintained in this game. It is very easy to kite enemy characters and hostile spellcasters will waste their most powerful spells to monster summoning 1 creatures.
Overall the game is very good but I don't understand why the AI was not improved