ratings 
User ratingEvery registered user can rate any game in the BGG database. Although these ratings are entirely subjective, here are the suggested guidelines:
- 10 - Outstanding. Always want to play and expect this will never change.
- 9 - Excellent game. Always want to play it.
- 8 - Very good game. I like to play. Probably I'll suggest it and will never turn down a game.
- 7 - Good game, usually willing to play.
- 6 - Ok game, some fun or challenge at least, will play sporadically if in the right mood.
- 5 - Average game, slightly boring, take it or leave it.
- 4 - Not so good, it doesn't get me but could be talked into it on occasion.
- 3 - Likely won't play this again although could be convinced. Bad.
- 2 - Extremely annoying game, won't play this ever again.
- 1 - Defies description of a game. You won't catch me dead playing this. Clearly broken.
How to do it?To do this, find the game and go to that game's Main Page; this is most easily done using the Search option near the top of every page. In the topmost section is a series of stars labeled "My Rating", which you can click on to set your rating on a scale from 1 to 10 (once set, you can click on edit to use decimals). You can alternatively go to your In collection drop-down arrow, click on Edit and fill your rating there.
Common proposals and complaintsVarious ratings-related proposals and complaints appear repeatedly in the forums.
- Very many diverse proposals for "improved" formulas, sometimes including purported "mathematical proofs" that the new proposal is clearly superior.
- Complaints about low ratings perceived as malicious or trolling, with various proposals to disallow such ratings (which are complicated once one tries to formalize them in detail, e.g. how to define and prove a "bad faith" rating, how to police them, etc).
- Complaints about ratings wars between 10-raters ("Cool minis, can't wait for this game!") and 1-raters ("Countering the hype!")
- Complaints about ratings for unreleased games, with various proposals to disallow rating unreleased games (which are complicated when trying to formalize them in detail, e.g. how to define an unreleased game, how to police this, what about playtesters and others who really have played it, what about games with multiple versions & editions, etc).
- Proposals for different text descriptions / meanings of the values 1-10.
- Proposals to only allow people to rate games which they've played, or which they own. (But many users have no interest in logging plays or marking their owned games. And nothing prevents users from falsely logging fictitious plays or falsely marking a game owned.)
- Proposals to only allow people to rate games if they also write a user comment about the game. (Which would probably cause an increase of hastily typed useless vapid user comments.)
Current BGG policy is that users are allowed to rate games however they wish, as long as each person only rates a given game once.
Ranks
The User Ratings are also used to determine the Rank of a game (expansions and compilations - games which use the contains field are not rankable) in the BGG database.
Only games that have at least 30 User Ratings are eligible for Ranking and to the User Ratings are added a number of "dummy" ratings, which are then used to produce a new average Geek Rating. (E.g. see this thread.) This is the rating that shows up in BGG searches and the number can, and does, vary from the Average Rating. It may be that once a game is in the database for a year or so, it also gets a geek rating even with fewer ratings, based on this thread.
In effect the "dummy" ratings move a game's average towards the norm of all games on the database - making games with few votes but very high ratings lower ranked than games with many more ratings but a lower Average Rating. (If you want to know more about this process, search on "Bayesian" within BGG.) Additionally, secret undocumented stuff is done to try to filter out obviously bogus "shill" or "hate" ratings. And Aldie has said that subdomain ranks are calculated using a subset of users who tend to rate games of that subdomain. (There are many threads from people asking about or trying to figure out the details, but they are intentionally undocumented.)
Note that the number of "dummy" ratings apparently depends on the total number of ratings. This explains the apparent "paradox" (often asked in the forums, e.g. here) of why game X is higher ranked than game Y overall, but game Y is higher ranked than game X in subdomain Z.
Another rating: weightA further rating you can give to a game is the Game Play Weight. This is another personal opinion expressing how difficult the game is to play - either because it has long and/or complex rules, requires deep thought to play well or some other factor. "Weight" is not actually defined at BGG so different people have different ideas of what it means. The choices for Game Play Weight Are:
- Light
- Medium Light
- Medium
- Medium Heavy
- Heavy
How to do it?Click on the Weight or the 'Complexity' rating. It will display the current *results*. Press *Go to Poll* button, select your option and press *Vote*. It is done and the system remember your vote (you can change it).
All recorded Game Play Weights are then averaged to produce a single Game Play Weight that is shown in the "Statistics" section for each game as Avg. Game Weight.
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