While looking for some information on gender issues in games this site titled Beyond Point and click: The Search for Gender Equity. located at Gives three main guidelines for determining whether or not a game is a good game at the very bottom of the site.
1. Is the game educational?
2. Is the game equitable?
3. Is it a good game...fun?
The link referenced is dead but I was able to locate the page at this URL http://www.terc.edu/mathequity/gw/html/gwhome.html.
This site seems to have some good information on selecting math games for both boys and girls.