Love it. Argentina and Holland have always been my favorites. Of course I pull for the U.S., too, and I hope one day I'll be able to take myself seriously while doing so, but really I just love the event. I can watch every game and pull for someone. I think it kinda' goes like this for me:
Argentina/Holland/U.S > North/South American and Asian teams > African teams > France/Former Soviet nations > rest of Europe.
Really, I just root for grudge matches too. The atmosphere in games like England-France/Germany, US-Iran a few Cups back, is what sports are all about.