Ive been to some festivals and such and the trouble is always to stand on the right place, ive seen some bands where i didnt even hear the vocalist and some others were everything sounded really good. Sometimes the sound just blow away thou.
Metalcamp in Slovenia have their only main stage in a small valley, there i didnt have any troule with wind. But Wacken have that, flat landscape and a huge stage. Thats why i like the small ones they use to have in tents or similar.