In Riga we were discussing having a 
1) a generalized DVM that finds events that indicate an opinion on the thing (product, app, etc) and filters out the SPAM; that feeds into
2) DVM specific to a usecase that takes that opinion data and summarise it in a whay that is useful to a client. eg so they can prioritise its display in the interface or express the opinion through words, emojis or, god forbid, a 1-5 star rating.