Andrew Norcross and his cohorts at Reaktive Studios have released their first commercial plugin, called Reaktiv Ratings. It's a commercial star rating plugin for posts and custom post types. It'll run you $39 for a single site install. There isn't too much in the way of balancing simplicity with the right features and flexibility in ratings plugins, so this could fill a void.
For this site, I use Pippin Williamson's Love It Pro, which offers simple up voting, as I didn't need stars. Between these two plugins, I think your voting / rating needs are probably covered. I bet both of these plugins could do some fun integrations with BadgeOS as well (hint, hint) if they put their minds to it.