I'm part of a small group of individuals who write the material for our rotation lesson. One of the reason I got into doing this is I was tired of receiving the lessons with only a couple of weeks to prepare (maybe I'm outside the box from most people) or getting it handed to me the morning of the first Sunday rotation. I want time to view, understand it, take it in, ask questions if I need to and learn it in case in the middle of class it isn't working in the back of my mind I at least can have a back up plan (or improvise using the objective and goals given to me.)
I do feel it would probably depend on the group you are working with. What gifts has God graced your congregation with? I like it with just a couple of us writing a certain rotation (ex: computer, temple). Where another church in our town had a group of people to brainstorm with and write the lessons.
Blest be the Tie the binds us.