1. Listing measurements because the actual measurements often differ from the product page.

2. Pictures for me. I am super visual products, colors, size, etc can look very different in real life. I love size comparison photos as well.

3. Telling how the the toy (if it's a toy) worked for you. I don't need an erotic story, but I like to know more than what the product page tells me. I like reviews to be personal as well as technical.

I think there are many things that make a great review but these are some of the important ones to me.

The details I find most useful are:
1. Vibration pattern descriptions.
2. Power and noise levels.
3. Storage ideas.
4 Alternative uses and experience facts or suggestions.
5. Control details.

I mostly read lingerie and clothing reviews so for those, photos of the clothing on the person, and sizing info is all I need. A giant review that I have to sift through to find that info to me, is less helpful.

The details I find most useful are:
1) Maintenance
2) Travel Friendly
3) Ease of use and adaptability
4) Pertennt to my use, I.e. what level of toy it is, beginners, intermediate, or advanced
5) Waterproof
6) Versatility, on vibrating toys, what part of the body can it be used on?

How easy it is to use. If the buttons require excessive hand strength, I want to know that, as my husband and I both have disabilities.

Noise level. A noisy toy is an active turn off to me. Tell me if you tested it to see if you could hear it through the covers or through a closed door, etc.

Any little "gotchas" that might catch someone out, but not necessarily show up in standard descriptions. An unexpected seam, a battery compartment that jams, difficulty holding onto the toy when in use, and so on.

I would say all the things that are listed on an extended review template
but especially the stuff that they cant find on the product page and other sites so you can avoid the all too common internet mistake when it comes to fit plus flexibility is a big one and strength cause how can you tell that from a picture.
for lube and body product reviews I think that ingredients are probably THE most important thing.

oh and of course experience

i love pictures - they are always helpful

It really depends on the toy but generally:

1. Great pictures that give a more realistic projection of how big the toy is rather than just measurements because I am more of a visual person and I think an inch is way longer than an inch actually is.
2. Why the number of vrooms, bees, and stars were given. Especially vrooms since everyone handles power differently.
3. Battery life. Whether or not it eats batteries or takes x10 longer to charge than use.
4. Material details and hardships with cleaning/storing.
5. General annoyances they had with the toy. For example, if the toy whistled or something when it turned on.
6. Comparisons to like products/cheaper alternatives. If the product comes with an alt. version or v2 then how does it compare?
6.1 suggestions of like products

Personally, I want to hear about experiences, creativity with the toy and an honest opinion. I can read the specs off the items page.