There is no way we will score a goal against Germany - their strength is defending in the air. All we have in attack is long balls to Kennedy, they will eat those up for breakfast. Best we can hope for is 0-0. Our defence isn't good enough to keep a team like that scoreless, IMO.
We must beat Ghana if we are to progress. There is no way we are a better side than Ghana, though they are definitely beatable. Remember that they are playing in Africa, so this will be an advantage for them. They have it all over us in midfield with Essien, Muntari, Appiah and Asamoah, but they are a bit thin up front. Gyan is OK, but he's a bit hit and miss in front of goals.
Serbia will be interesting. They have been great in qualifying, but generally don't do well in tournaments. They have an excellent side on paper though, and some good players in there Zigic will be handful up front, though I think our defensive mindset may force them to alter their natural game - they like to keep possession and are very technical.
It's a very tough group and we will do extremely well to qualify.