I wish there was a more balanced warscore system...more akin to an EU system where I know what score I need to achieve results. I am tired of the AI not accepting peace when I have 60, 70, 80 warscore at times. Irritating that I often have to pretty much get almost 100 (or sometimes 100 itself) to get my demands met.
I think it's balanced around getting 100% in order to enforce your peace deal. Getting 100% in CK2 is much, much easier than in EU3. In EU3 you have to occupy them fully, while in CK2 only partly, and usually only a few counties at most. Large battles count for more too.