Why was Ezra included in the canon?

As a Christian, I know we shouldn't have a "[canon within the canon](http://www.scriptoriumdaily.com/2011/09/19/canon-within-the-canon/) ", but I'll admit, I just can't get worked up over Ezra. I love Malachi. I could for a long time on 2 Peter. I can even find stuff in Leviticus worth reading, but try as might, I just don't see anything interesting in Ezra. Understanding that I really do see theology in really obscure places, can someone help me see what is theological about this book?