Hi Sam, as per our mail, I think the usefulness of the tool could be increased a lot by having the results be between a decade of the users choosing, as well as excluding all films of a certain 'meta' genre, those being documentary, and animation. I know movielens.org suffers from this same issue, and will often end up recommending you things like 'stand up' comedy specials or documentaries, even though your preferences are clearly for fiction films.
I don't think its necessary to have every genre listed, but I do think documentary and animation should definitely be their own thing when generating a list of results. As for the decade, it makes it a lot easier when doing any serious kind of film research and wanting to get a good vibe for what the highest rated films looked or sounded like for that specific point in time.