Actually the Liberty Of The Seas has been around for less than two years. During a transition of ownership and other technical issues, no reviews for any ship were posted. All of this happened during the timeframe that the Liberty debuted and for most of the ship's life (brief as it is). The new software was rolled out last fall which allows users to submit reviews. Since that time, it just so happens that only one review of the Liberty has been submitted.
The reason for the other ships having many reviews is that we had a large database of them which were rolled over into the new website. If you look you'll see many are a few years old.