I don't understand why the years only show to members? Surely that is one of the more important of the many aspects of reviews. Even if I was a guest Viewer i would be more interested in a review from say 2011 than 2008. Also people who visit the same hotel year on year put, in useful things like if the hotel rooms have been updated, it's good to know which year that type of thing has been done.
It was something we were trialling to improve search engine results we haven't yet completed our tests. Like I said above and previous posts we know it is a good piece of information to have. Which is why it's shown to members and when we have completed out tests we will show to guests as well.