I agree 100%.I might take some flak for this, but I was most happy to see Catelyn die. I found her character very boring, and I can't stand people who repeatedly follow their heart into ruin; and she certainly did that time and time again. There's a certain sympathy you can feel for her after she loses so much, but that mostly evaporated for me after she let Jaime free. What kind of idiotic move was that? She didn't single-handedly end the reign of the King in the North, but she certainly started the cascade of events that led to his downfall.
She consistently reacted stupidly and emotionally. Some might argue that she reacted as a mother, however, the fact is that she just plain didn't think.
From imprisoning Tyrion to setting Jaime free to arranging for Robb to marry a Frey. Not to mention the collision course with Littlefinger.