Does Craft have a discussion forum and ratings add-on?
There is no discussion forum available in craft as of now but people that need that function seem to be using Vanila Forums and just integrating with single sign-on which seems to work just fine.

There is this which could work for ratings: http://plugins.supercooldesign.co.uk/plugin/button-box which is a bit simple but depends on what you need.

There is also this which could allow 'likes' https://dukt.net/craft/like

I thought I had seen something with a bit more advanced ratings but can't seem to find it now. At the end of the day though Craft > ExpressionEngine in pretty much every way. There are very few things EE can do better than Craft and even then it's usually due to a third party add-on being available there that is not yet available in Craft due to it's maturity.