Eddie Jordan wrote:hated when professors gave pretty large scale assignments with vague descriptions, then had this "no no you guys did it all wrong" attitude when 80% of the class handed in an "uhh...is this right?" assignment.
I have some sympathy, but college students are adults, and if they are uncertain, they should ask for clarification. Also, you could discuss your idea or a rough draft during office hours. Just don't go in saying something like "I have no idea what to write on". Because that's really annoying.