Ask HN: How successful are businesses like stackshare and capterra?

They both seem to have shallow content - for example, I looked at this page http://stackshare.io/leftronic (which has just a few lines of marketing jargon) and a few others. Capterra targets different audience but the content is not that great there either. Both sites have advertising and capterra also does consulting.

My question is - how successful are these companies? Are there better sites than these (targeting developers and/or businesses)?