Let's not forget that we have customers who do not speak English as their first language and there are going to be mistakes in the review. There are also people who have mild to moderate learning disabilities.
It is okay to point out simple errors in the comments section, but what is not okay is to pick apart a review line by line pointing out every error unless you happen to be that person's mentor.
We all make mistakes, even the most profilic of English speakers get excited and type things incorrectly. There's no reason to come down so harshly on reviews either in the forum, or in the comments for the review itself.
If you are a mentor and you see someone struggling, be friendly and offer to help them out with their reviews. If there are one or two errors, there is absolutely no reason to mark the review lower than useful. If the review is completely unreadable, say something, bookmark it and give the person a chance to fix it before you vote. If you don't want to go that far, then don't vote at all.
As far as required information is concerned - your experience during use is the only
requirement for a review, without turning your review into a piece of erotic literature, that is.
If the information for the material, safety rating, and sizes are on the product page and the user has detailed what they like and don't like about the toy, then they have written a useful review. It's really just that simple. Pictures aren't necessary nor are perfect grammar and spelling necessary, if you are able to grasp what the user is trying to tell you.