To me it seems that some people do not take the review feature serious enough. I see several questions by new members that need serious improvements. How can this functionality be improved?
Well indeed I don't take it seriously because it's not a serious feature. Some users already took away its functionality long ago and as barbara mentioned I've not seen a single new user question in the reviews since a year and some months. Probably the review system distributes the reviews to some users and locks for others to (wildly guessing here) reduce the review clashes.
I recommend editing the questions directly instead of that review system as much as you see them on the site. Nothing came good out of that system as far as I know other than light speed question closing.
Also no improvement is serious here. Because serious tone always causes trouble.