[ehurrell]

I agree, although with enough users this subjective marking effect can be somewhat mitigated. I'll give an example: Steam allowed people to tag games recently, which lead to a lot of 'hardcore gamers' tagging games they didn't like because they had no explicit gameplay as 'Walking Simulator' (Gone Home, Dear Esther etc). This tag is meant as an insult, but for people who like games like this it is actually useful, it's a grouping of games that are interesting to similar people, which is the knowledge Valve presumably wanted to gather.

I would suggest a mix of automated and manual tagging, use both, show the automated or curate the text shown. It should be easy enough to cluster the tags too, one man's walking simulator is another's 'story game' or similar.