You should have kept your iPhone as a backup, that's what I did as I knew it was going to take some time testing the Nexus 5. Now if you returned the iPhone 5C, just wait for some update for google to fix the camera issue. I believe someone posted a link here from xda developers that they have a patch to fix the camera issue.
Any other minor problems you may have from google, you may consider an RMA. I'm still waiting for my RMA to reach them and see how much they are going to charge me for restocking.