1. A computer-implemented method of associating reviewable attributes with items, comprising: under control of one or more computer systems configured with executable instructions, for a first item in a plurality of items in a catalog, identifying a reviewable attribute of the first item as being configured to receive a review from a user, the reviewable attribute including a placeholder element for receiving attribute review text associated with the reviewable attribute of the first item; storing the attribute review text associated with the reviewable attribute of the first item for subsequent display with the first item and information relating to the first item; analyzing the reviewable attribute associated with the first item and information relating to the first item; creating a model for the reviewable attribute using the information for the first item associated with the reviewable attribute, the model configured to associate the reviewable attribute with at least a second item such that the second item is configured with a new reviewable attribute placeholder element; applying the model to at least a subset of the plurality of items to determine whether the second item in the subset should be associated with the reviewable attribute; when it is determined that the reviewable attribute should be associated with the second item, storing the association of the reviewable attribute to the second item to enable the new reviewable attribute placeholder element; and in response to a request from the user to review the second item, providing for display at least the new reviewable attribute placeholder element based at least in part on the stored association, the new reviewable attribute placeholder element configured to enable the user to supply a review for the reviewable attribute.