I find it useful. Individuals are very bad at being balanced. Seeing two opposed viewpoints and weighing them up for myself gives me a better basis for making decisions.
This reminds me of pg's "What you can't say" essay[2]. We may be able to identify areas we are wrong by evaluating the topics on which we are most unlikely to allow dissent.
If you want balance, you need to seek it out, both consciously asking people with measured responses what they mean and discounting people who hold extreme viewpoints.