Usually maps that are deserve to be deleted are: 1) Maps which have much more dislikes than likes. Example (50 Likes / 100 Dislikes should be deleted. 50 Likes / 55 Dislikes maps shouldn't be deleted). 2) Unplayable maps which most "noobs" aren't able to finish it. 3) Simple maps in which you just keep pressing "W" most of the time. I don't play on race so I don't know much but that what I think. Note: These reasons above are in general. Exceptions can be made.