The dots are not necessarily tied to point levels, they're more of an approximate indicator. Points can be given or taken away based on how people vote for your helpfulness or lack thereof.
And yes, you can see who voted for you, or at least the last 5 votes and their comments. You get see that by clicking the Profile link up at the top to get to your Profile and then on the top of the right hand navigation page, click "Control Panel".
Or go there directly with this link:
http://www.mac-forums.com/forums/usercp.php