I enjoyed this movie tremendously, but then again I'm a big Theodore Roosevelt fan. The movie does nothing to damage his reputation and is minimal in its application of modern sensibilities. There's lots of action, which closely mimics the historical accounts I've read. Believe it or not, by all reports TR was much as he is portrayed. Good performances abound with Tom Berringer topping the list.
I'll skip trying to tell you what was on these peoples mind when they went to war, however, TR had been de facto Secretary of the Navy and a politician for quite a while so I vote for less naivete than hinted at by another commentator. That said, true believers are reported to have been a far more common breed at the time.
A good rent, but I wish it were available on DVD. Talk to Ted Turner about that.