The Arizona Memorial is definitely worth the time. It is a very moving experience. The Visitor Center has a lot of memorabilia, and a fantastic movie of the history and attack on Pearl Harbor.
Then you board a boat and motor out to the memorial itself, a structure built above the sunken ship. There are pictures and diagrams to show you what you're looking at, as you look down at the ship under the water, including an oil slick still rising from somewhere in the ship. The names of all the sailors onboard are etched into a wall. Very often, there are wreaths or notes or other tributes left by family members, military or non-military visitors.
The whole experience gives you a great understanding of what happened, why, where, and why we owe so much to those who served, and continue to serve today.