Captip to The Crawfish Boxes for the link to The Hardball Times' OF fielding statistics.
Of note is Bourn's 113 out-of-zone outs.
It's that final number that I think demonstrates how great defensively Bourn is. It can't be easy playing CF in a park like MMP and covering for one of the worst LFers in MLB. Remarkably, Bourn does it, and does it well.