When we were setting up the new site, we really wanted to put a better focus on reviews of sets, and open it up to everyone to provide their feedback. We didn't have some sort of crazy agenda with it, it was just easy stuff to talk about... after all, most everyone on the site is going to be looking at these sets, and often buying them. Sometimes, we might even open the boxes and look at them, or, gasp, play with them!
The existing guidelines are still valid and helpful; to be honest, they're pretty basic, and give you a lot of latitude on what you want to do. Want to skip pictures entirely and do a video review, we'll even be on board with that (though to be honest, some of us really hate clicking on videos unless they involve kittens sleeping or comedy singing acts).
What we don't want to see is a simple summary of your feelings on the sets. Or no pictures and just a wall of text. There certainly places for stuff like that, but not in a review. A review is about sharing what you liked and didn't like about a set; more than that, it's about showing us why you liked or didn't like it.
Does this mean we don't want you to contribute if you can't take pictures or don't have a camera? Well, yes and no. If you can't contribute the basics, don't start a new review. Feel free to go and respond to existing reviews, or to the sets threads in the other forums. But it's a matter of respect for everyone else in creating a review thread to spend a bit more time to flesh out what you're thinking and explain it. Overall impressions are great, but dig into the set a little if you want to create a new thread.
In another famous dWhisper Analogy© think about when you see a product review on Amazon. Sure, those include pictures, but they do have text. What's more useful to you when you're looking at a product? A short one line that someone didn't like it, or an explanation about how someone was impressed with the stitching and quality of the SharkBanana, but wished that the peels did a better job of closing around the shark? The same thing applies to a review. Tell us and show us what you think so we can make a decision based on it.