Not bad point.
When I first saw Van Hilisen I thought it was one of the most fun movies I ever saw, while at the cinema I learnt over to my friend and said "This will be the next Indiana Jones"
, and he agreed.
Later, when it got quite bad reviews I was baffled, and seeing it later on dvd it created no where near the same impact. Sure, I still found it fun, but more of an 80% rather then a 90% type thing. Something about the viewing conditions might have influenced the film.
This could also explain why I enjoyed Superman Return, and Harry Potter 5 a lot more then most people (I saw both in Imax3d).
On the other hand...it could be I just like them more then most anyway on my first viewing. Short of erasing my memory its hard to be sure.
But yes, viewing conditions should be a factor.
However, I don't think I would include personal viewer-specific things in this like some of your examples."be in a cheery mood"
Id find more relevant then "Be a Zelda fan".
Because, given enough reviews and long enough, the system should already be putting at the top of your lists reviewers that are similar to you in terms of taste.
So, to me, it seems useful to add "Conditions you experienced this in"
rather then "Conditions you find relevant to enjoy it".
The second gives more information, but I think assumes too much.
I want people to find new things to try using Rateoholic, and not be put off by reviewers assumeing people need to be like them in certain ways to enjoy it.
Personaly, I look forward to finding really bezire links between fandoms