I have one better for you.
Mothership Zeta for Fallout 3. Here's why it can be worse than Dawnguard.
1. Came on the heels of Point Lookout, the best DLC gamesas made for FO3 by most accounts.
2. Had good promise of expanding the FO universe, but fell flat on its face in that regard. Designed as a linear dungeon crawl, with minimal story.
3. Can't return to previously-visited areas once finished.
4. The head of QA at the time was (probably) fired over how badly buggy the game was. Gen. Chase's overcoat isn't an overcoat, and many people had issues getting major scripts to run. Not all holotapes have sound, and Alien Energy Cells are still rare, DESPITE BEING ON AN ALIEN SHIP!
5. One of the bugged holotapes indicates a possible aliens-caused-the-war scenario. Which flies in the face of what the Fallout series is supposed to be about. So, possibly Lore-breaking.
6. You get to be captain of your own spaceship! Too bad there's NOTHING TO DO AT THAT POINT. Not even "random space encounters"!
7. Worst. Boss. Ever. Hardly any effort to destroy the "boss." Yes, if you somehow get your level 1 character to it, it's still easy.
8. Have to do an EVA. In a spacesuit. With your pip-boy hand exposed.
9. If you're unfortunate to do it at the level cap, ALL THE ENEMIES ARE BULLET SPONGES.
10. DLC is geared for EW players. Specialize in Small or Big Guns? svcks to be you.
In fact... the only thing MZ has going for it is a spectacular design and some items that automatically repair your weapons.
Ok..OP don't care for the DLC... But I want to know... WTF was so bad about Horse Armor? ...it was $2, for crying out loud.
It's not the cost, it's the principle of the matter. The Dev team decides to put in a largely useless feature and decides to CHARGE you for it. Give a modder about an hour and they'll make something better, that you can get FOR FREE. Get where I'm going? Horse Armor doubles your mount's health up to 750 health. That's all it does. How often do you get into a situation where your mount dies?