I don't know if its me, but as I'm getting older, I feel like my enthusiasm for the Summer Olympics is waning for some reason. That stated, Winter Olympics will always remain good with stuff like hockey, speed skating, all of the outdoor sports (skiing, snowboarding, luge/bobsled, etc.), etc.
Edit: Oh wait, I forgot. There's been talks of NHL players not making it to the Winter Olympics. Well, there goes some of that enthusiasm.