I would agree to run from Mr. Barth. I haven’t read any of his works but have read a bit about him. I know that he denied the full inspiration of the Bible. The Bible errs, according to Barth, simply because of its human involvement. Barth popularized an overemphasis on God’s transcendence. Barth, and other neo-orthodox theologians thought that since God completely transcends the created order, he is therefore totally different (or “wholly other”) from his creation, making analogy between and the Creator and the created impossible, which makes any discussion about God entirely irrelevant.
Barth was influenced by Søren Kierkegaard, who I know to be another person to avoid as he believed that "truth is subjective."
Just out of curiosity, why were you interested in him?