Yeah... When the game really wants to fuck you over, it doesn't hold any punch... It can even lead me to ragequit at times because of how frustrating it can get. One of the worst cases I got was a game I had started as King Philippe I of France. At the time, Flanders was still de-jure part of the HRE (recent patches changed that) so I got the Kaiser declaring war on me on day 1 which was already a promising start... But then, Philippe died young and heirless and I thus played his younger brother Hugues II, there was a faction that turned into a rebellion, I was starting to lose everything when, top it all, the Pope excommunicated me...Okay, I'm a little, little, REALLY mad.
So I was messing around in Ironman as the Byzantine Count/Duke of Mallorca in the earliest start, trying to build an Orthodox Visigothic little chunk of land. For a few generations, so far so good, right? Well, I slowly start marrying into various landed families and ensuring that their daughters end up on the throne, at least of counties. I do this, and at one point, my ruler's grandsons end up in the court of their mother, my daughter-in-law. She does not let me educate them (making them Greek), and when my ruler then she finally expire, she's married off the sons matrilenally.
So when I play as the son, I attempt to plot to murder his (landless) wife, as I soon realize that these three heirs (one son and two daughters) are not of my dynasty. I get up to 300% assassination score, but nothing happens. In fact, the idiots in the plot keep blabbing about it, making my wife -1800 towards me just on attempted murder alone. I switch to Seduction focus, hoping to get some illegitimate children I can legitimize. I do, she hates me even more. I finally just imprison my wife and execute her, which angers my vassals (though they're just baron-level, so no threat). I go, whatever and remarry. No children for a couple years, but I've got the illegitimate kids to legitimize if I need it. I decide to imprison and execute the only son I have from the matrinlenal marriage, and to make sure it works, I park my marshal on my little province of Mallorca. 77%, it says. "good enough" I think, and click to imprison him. It fails, and he flees to a Sunni court somewhere (???). I cannot plot to kill my son even though he's a faithless matrinlenal child. Still doable though, I don't think he'll be popular as an Orthodox Visigoth in a Sunni Bedouin court. My ruler suddenly gets Infirm. I panic. He gets Incapable a day later. I panic again. He dies just three days later and I lose because my eldest son is of a different dynasty. I yell at the computer screen.
I try again, this time as the Visigothic Catholic Count of Narbonne in Carloman's kingdom in the Charlemagne start. I'm doing well for the first 9 years, I've got a few heirs, had Hunting focus, got a few cool events, and just in case, my ruler also has a few illegitimate children as a backup. Suddenly, my liege the Duke of Toulouse demands my my province. I'm annoyed, but I have stockpiled up gold for the "Amass Wealth" ambition, so I hire a 150 gold mercenary troop, and gather my regular troops to stand against my tyrannical liege. My troops are broken easily, and flee to the north while my liege sieges Narbonne. I get a loan and hire even more mercenaries, and beat back my liege's forces, unsieging my holdings (I had one left before defeat), and I go one province north to siege my liege's provinces, because it seems like the threat is over, and I don't have much money left so I want to end the war as soon as possible. What I don't realize is that my liege's troops just came back to siege my now unprotected province, and they do so and I lose.
Ugh, sometimes I hate this game. And love it at the same time.
At the same time, while it's frustrating and rage-inducing on the moment, it can make for fun memories when you look back...