Boiling Oil...

[Jambo]

I never liked Burning Oil as it just ruined the AI during siege assaults. It would kill the general and rout all their units as they tried to enter the gates. CA had better make sure that the AI is capable of using any new features they introduce.

[Furious Mental]

Sieges and fortifications generally are a bit basic in MTW 2. Nothing to throw on the besiegers, only one door at every gate (for comparison with a truly formidable real castle, the King's Gate at Caernarvon was intended to have 5 doors and 6 portcullises), no ditches or moats, no sapping, no flanking towers or barbicans.