I've looked at a couple of the systems already available and I think it's safe to say we want to aim beyond them.
This will need to be custom-coded and it will probably focus a lot more on organization and inter-linking (think keywords and meta-info, dynamic grouping, etc.) than strictly on formatting. There are lots of good page editing and formatting tools out there, from WYSIWYG systems to Wiki's to LaTeX editors. Writing and presenting the reviews is not the greatest issue, it's organization that will probably make the biggest difference. That and the quality of the reviews.