I would love to see Germany beat by Costa Rica in their own backyard..to funny. Not going to happen though.
I want Poland to beat Germany sooo bad. I am anticipating that game even more than the US games.
I have no strong feelings either way.
Other than that it is usually good for the tournament IMHO that the host team at least advances and stays in the tournament for a while.
If Germany was eliminated at the group stages it would put a bit of a damper of the party atmosphere in Germany.
Cheers.