I guess I would be looking for categories, and how the book fits into each:
Recipes - sides, BBQ methods, sauces, rubs
How-to - smoking, grilling, oven, crock-pot(thats for Tom <g>
Tips & Techniques - competition, home, large amounts, etc
I would think if you/we came up with a list of categories like that, it would be pretty easy to do the review. Maybe a score in each category.