I barely even count the 'fringe' sports IE: Poker, Bowling, Pool, Darts, Ect... but they are just unbearable to watch for me.
I can't stand car racing. far too repetitive and it's kind of hard to consider drivers athletes (Yes, I know they are under immense physical stress & need good reflexes, but when you are watching they just seem like guys driving in big circles for about 3 hours).
Of the major sports, Baseball is one of the hardest to watch, unless it's live or the post-season. Hockey was really terrible for awhile, but since they changed the rules up and people can actually score now it's not so bad.