This thread is going to result in an argument about DLC. But, here it is anyway

The most rubbish DLC on Xbox Live

DLC: Horse Armor
For: Oblivion
Price: 200 MS Points

DLC: LV. Up & 300,000 Gald
For: Tales of Vesperia
Price: 200 & 300 MS Points

DLC: Time Is Money Pack
For: Skate 2
Price: 400 MS Points

DLC: Weapons, Skins & Costumes
For: Dead Space
Price: 120 - 320 MS Points

DLC: Darth Vader
For: SoulCalibur IV
Price: 400 MS Points

DLC: Transformers Unlockables
For: Tranformers: The Game
Price: 500 MS Points

DLC: The Rest of the game
For: Beautiful Katamari
Price: 200 MS Points apiece

DLC: Extra Character Data
For: Onechanbara: Bikini Samurai Squad
Price: 500 MS Points

DLC: VR Levels
For: Vampire Rain
Price: Free
My personally most hated DLC are ones like "Time is Money" in which you just pay to unlock crap already on the disc. Rumble Roses XX had this and it pisses me off to no end.