I thought it was pretty good, even though the storyline itself wasn't extremely compelling throughout.  The movie presented the story of a group of American pilots who joined up with the French during World War I in the early years before the United States entered the war.  They flew during the early age of military aviation of biplanes and tri-winged planes, so it was an interesting side of military history.  I thought the aerobatics were pretty good, as were the special effects.  One thing that was troubling during the movie was the sentiment expressed by a few of the main characters.  They brought a deliberate apathy about the war to the story.  Somehow I can't exactly believe that fighter pilots, fighting against their neighboring country, would be so carefree about a war that decided the fate of Europe and possibly the world.  I'd think they'd be much more concerned with the war's result than what the characters suggested in the film.