Kucinich is not an issolationist. He is wanting to have the U.S. rejoin the world, not as the "all powerful" but as part of a world community. He feels that USA should join and be subject to international courts of law. He sees diversity as the strength of America and understands that it can also be the strength in a world community.
Although Kucinich was not "loved" as a mayor in Cleveland during his term, the city now recognizes his positive contribution. He kept his promise not to allow a public utility to become private. At the time this seemed like a bad move; however, today it is proven that he has saved tax payers millions of dollars by keeping his campaign promise. He is for the every day citizen, NOT big business.
As far as standing up and facing Bush, Kucinich led the House effort to vote against going to war. He stood his ground, actively recruiting over 100 Congressmembers to vote with him.
As for his standing on terrorism, read the "Prayer for America" speech (link below) to get an idea of his view.
http://christianity.about.com/librar.../aa030602a.htm