My two worst stadiums:
Candlestick park where the wind whipped off the bay and left you frozen. If you survived an extra-innings game there you were awarded a Croix de Candlestick button. It was amusing though to watch the trajectory of the ball in the wind.
Oakland Coliseum was a place were you took your life in your hands getting in and out of there. And if you were at a Raiders game it was just as dangerous in the stadium. Once at an A's game Billy Martin threatened to come in the stands and beat up my buddies and me.