If there's anything at all that should be changed in Mount and Blade 2 from the original is, PLEASE fix the siege mechanics. Sieging is the single most annoying, ridiculous, and unrealistic aspect in the original game.
From starting the siege (preset siege items) to the stupid inner castle/city attack after already WINNING the siege battle. I do not understand why I can only have 3 guys with me to fight off 4-5 guys in a small area (especially as a bowman, it's annoying to get stuck in a close range area, even worse if I happened to get knocked out during the siege and start with 1hp). What's even more ridiculous is losing that battle kicks you out of the siege and you have to REBUILD the siege items to attack again, which is bull**** when they supposedly only have 4 guys in that castle and you may have 50+ guys left over sitting inside the fort. It makes no sense and makes winning a tough fort battle less meaningful.
PLEASE remove that inner battle mechanic, it's unnecessary.