1. Power Level: Brain Control was incredibly powerful. It could take control of any monster on the field, regardless of its attack or defense power, making it a devastating card that could turn the tide of a duel instantly.
2. Lack of Counterplay: There were very limited ways to stop Brain Control once it was activated. Its effect was immediate and irreversible, leaving opponents with little chance to react or recover. This made it extremely frustrating to play against.
3. Unfair Advantage: Brain Control allowed players to gain an unfair advantage by stealing powerful monsters from their opponent. This led to a situation where the game could be decided based on who drew Brain Control first, rather than on skill or strategy.
4. Limited Strategic Depth: While the card was powerful, it wasn't very strategic. The card didn't require much thought or planning to use effectively, which made it less engaging for players.
5. Meta Domination: The card saw widespread use in competitive play, dominating tournaments and making other strategies less viable. This created a stale and predictable meta where players simply had to find ways to out-Brain Control their opponents.
Overall, Brain Control was banned because it was deemed too powerful, unbalanced, and unfun to play against. It lacked strategic depth, was nearly impossible to counter, and created a stale and predictable meta. While it was a powerful card, its presence ultimately detracted from the overall gameplay experience.