[dragonwriter]

Well, I'd prefer annotated recommendations with reasons, and analysis of quality as a big feeder into the recommendations (so, both opposing and supporting--and even supporting in part and opposing in part--viewpoints, especially with stronger support, would be natural recommendations, with their relationships to the thing you just viewed annotated.) OTOH, that's probably a lot harder to do (especially automatically; intuitively, it seems likely to be essentially an AI-complete problem, though I wouldn't be too surprised if someone found a way to do a "good enough" version for common classes of content without a full AI) than what typical recommendation engines do; the annotated related items thing is found some places, but they are IME always manually-curated, narrow-focus databases (e.g., commercial legal authority databases.)