I saw Windtalkers on opening day... I am a fan of WWII, John Woo movies and Nick Cage, so I couldn't pass it up.
Overall, the movie was entertaining, and didn't waste time on a useless love story (Pearl Harbor anyone?). However, if you're into realism of weapons and historical accuracy, be prepared to shake your head more than once. I didn't know hand grenades created a huge, bright orange fireball with sparks!
Also, the music and use of slo-mo made me feel like I was watching an episode of The A-Team sometimes, but it wasn't too bad.