19. A system comprising: a network interface to receive data records containing user feedback regarding at least one offering; at least one processor to: from among candidate attributes in the received data records, select a subset of attributes that relate to user sentiment regarding the at least one offering, wherein the selecting is according to selection criteria including frequency of occurrence of the candidate attributes, relative amounts of negative and positive feedback associated with the candidate attributes, and time density of feedback associated with the candidate attributes; and present for display a visualization of at least one sentiment characteristic of the selected subset of attributes that relate to user sentiment.
19. A system comprising: a network interface to receive data records containing user feedback regarding at least one offering; at least one processor to: from among candidate attributes in the received data records, select a subset of attributes that relate to user sentiment regarding the at least one offering, wherein the selecting is according to selection criteria including frequency of occurrence of the candidate attributes, relative amounts of negative and positive feedback associated with the candidate attributes, and time density of feedback associated with the candidate attributes; and present for display a visualization of at least one sentiment characteristic of the selected subset of attributes that relate to user sentiment. 20. The system of claim 19 , wherein the visualization includes at least one from among: a bar chart having plural bars containing visual indicators representing the at least one sentiment characteristic for the attributes in the selected subset; and a graph chart having graphs corresponding to positive and negative reviews for the attributes in the selected subset.