I like all boardgames, both Soulless Euros and Ameritrash, and everything in between.
I hate arbitrary decisions in games. I can't name one right now off the top of my head, but it's like they say about porn, "I know it when I see it." I love player interaction, and by extension I dislike, but don't outright hate, multiplayer solitaire.
A word to the wise, gleaned during the Great Agricola Heist of 2007:
Do not, under any circumstance, pants a board game in gym class. It will call your mother and tell her you died while eating your own poop.