You wanted to ask for so long but it was already answered a few times already. See one of my previous replies on Re: "Seen" status of replies
The ratings are anonymous for a reason: it's to protect members who might rate something unfavorably, for example.
This is also optional: members who want to make their rating known can attach it to a comment, which is not anonymous.
This topic gets raised every few months and I think it's working fine as is.