Brian,
Peer evaluation is an awesome opportunity for you to get feedback from others who have or have not taught the course. If they have taught the course, they know what to expect from students and how the course should "look and feel." If they have not taught the course, they almost have a student's perspective as they are trying to navigate the course and consider the layout, design and user-friendliness along with content.
No matter what peers are looking for or evaluating, it's all good feedback. Thanks!