I've had a go at Disqus before and could not get the widget to work. Disqus support made some effort to help - an email asking me to post problems on the forum - however we didn't make any progress.
I was recently pondering the fate of Outbrain on this blog. I like feedback... but annoymous star ratings aren't feedback. I'm also writing this blog for myself and not for any reader group.
All being well all new comments will go via Disqus and old comments remain where they are.