I mean that MIN should be on top and MAX on X-axis.
This needed to make chart more intuitive to read and related to object ranking, when 1st place is ‘better’ than 3rd. That’s why it’d be better to look this way:

(source: xantea.net) => 
(source: xantea.net)
This can be done using custom XML. I ran the Chart Designer (cfinstall/charting/webcharts.bar (or .sh) and simply worked with the YAxis setting. There is an isReversed setting which does what you want. Consider this code:
The query on top was just used for testing. The XML came from the chart designer. I removed everything but the yAxis stuff that used isReverse. Lastly, note how I specify style in the chart tag.