Yes, but Amazon's reviews are for products.. not hotels. Hotels get older and crappier thus newer reviews are more valuable.
I would necessarily say that hotels crappier as they age, but the service from hotels is elastic.
The same hotel visited 2 different times could prove very different. The same book purchased twice, on the other hand, will read the same.
On Amazon it seems like the opposite is true. Because of their meta-review process, where users can flag reviews as helpful or not, it seems like old and classic reviews tend to float to the top, while recent ones have a significant hurdle to overcome before they make it to the front page. See for example here: http://www.amazon.com/gp/product/0262011530
(Admittedly, users can also be fickle and support other kinds of reviews for different reasons, cf. http://www.amazon.com/Tuscan-Whole-Milk-Gallon-128/dp/B00032...)