I've been playing tons of Medieval II. Started as Venice, conquered Hungary after they DOWed me, fought with Holy Rome and Poland and the Byzantines until the pope excommunicated me, and then it was Total War until a 1346 Long Campaign victory. I controlled all of Italy save Rome, and all of mainland Europe north through Denmark, east until the border of the mid-1800s Russian Empire, and west through France, but not including Iberia. And also excepting Switzerland, because nobody ever conquered the Swiss.
I'd forgotten what a good game M2TW was. Definitely a nice change of pace, and the generals' traits were entertaining as always. My last leader made it up to Mongol-level amounts of Command and Dread by the end - 9 Command, 10 Dread (the max). Had there not been a max, he would have had 12 Dread, and had he not been an alcoholic, he could have had 12 command. Instead he was a mercilessly conquering alcoholic who, thought perhaps not deserving excommunication when it was received, certainly justified it after a reign of terror against the Poles, Germans, and, to a lesser extent, the French.
By the end, the only nation that I had halfway decent relations with were the Mongols.
Questions for the EU3 people:
How do I lower my war weariness? I'm stuck in this cycle now of constant rebellions to put down, which keeps raising war weariness, which leads to even more rebellions. How do I stop this cycle?
What about infamy? Is it more a matter of not letting my infamy get so high in the first place? I'm playing as France and my infamy went above 80.
Yeah, infamy that high causes all sorts of problems. I know, because when playing as Burgundy I intentionally let my infamy climb to almost 300 in the late game, just to see what wound happen. Pro tip: don't do that. All my neighbors declared war on my as soon as their truces expired, and I had revolts everywhere. You get a lot of nasty events for high infamy, such as +15% revolt risk in certain provinces - and fighting that will indeed make it hard to keep war weariness low (and since you'll likely be at war with your neighbors, it will be even more difficult to lower war weariness).
So yes, you shouldn't let it get that high. There's a red flag in the status bar with a number such as 80/42 - the first is your infamy, and the second is your infamy limit. If you go above the limit, bad things happen, and the farther above, the more bad things happen. You're pretty far above it - the highest I've seen the limit is about 45.
I would recommend releasing a few vassals, as IIRC in EU3, releasing vassals lowers your infamy. Release enough to get it below the limit, and within a few years the bad events will wear off, and eventually you should be able to get things under control. In the meantime, hire one of the advisors who decreases revolt risk by 0.3% per level, and perhaps also one of the ones who lowers infamy by 0.05 per year per level. And going forward, try to stay under the infamy limit!
See also, the
EU3 Wiki article on infamy (sometimes referred to by its EU2 name, badboy).