There are more reviews on IMDB and other rating sites that have the same opinion. I completly agree with them. Repeating the same naval commands again and again is not exciting unless you care for the characters and understand the situation.
Maybe because the movie is not that great?! ;) I love WWII movies. Can't get enought of them.
You get one big action scene from start to end. They don't try to explain to you the stuff and make you feel you are there. It's the same thing and dialog over and over and you just don't feel anything...