Seeing as how I would rarely watch any of the other sports on tv, meaning usually only if a playoff or very important game, I tend to judge them based on how much fun I have attending the event.
For me, women's basketball games offer nothing. I would have more fun sitting at home watching Las Vegas reruns than going to that game. Well, that's not fair, Las Vegas was a great show. Point still made. Baseball games can also be fun, but the product is pretty crappy.
It's a close race for me between Men's Soccer and Men's Tennis. Tennis matches are a very unique experience, where an individual, usually quiet sport turns into a team ruckus. Players shouting from court-to-court, fans often getting in ridiculous arguments, and there was often a keg provided by Sig Nu. However, soccer games can also get quite crazy. Though there was no keg, bringing in alcohol was rarely a problem in the stands or on the hill. Students got chants going, the sliding down the hill when a goal is scored, the taunting of the other team's players (especially the goalie)...Those were some great times. Think I've got to give 3rd place to Men's Soccer though only by a bit.