I'd encourage everybody to use the post ratings more. They are limited but they do help foster community. Again, I'd change them to "Thanks, Agree, Disagree, and LOL".
edit: Thanks for the "confused" icon, which is a really useless icon imo because it tells you nothing about the OP or WHY the person reading is confused. If you really want to have a negative rating like that just use "dumb" so everybody is clear. The ratings should basically just be used as shortcuts to typing out a post.
I spend way too much time at work on various forums. This one is way towards the bottom (even with the upgrade) as far as user interaction and redundant posts (that exist because there is no "disagree or agree" button). There are ALOT of cases where a simple "agree" or "disagree" button would save a lot of wasted scrolling.
The "like" is 80% of the time just an "agree". If you want to keep "like" than just realize people are going to use it as "agree". I do it rather than reply with "+1" or "I agree". It's a shortcut. Again, my opinion only, but there really needs to be an "agree" rating. That's the one I think would help the board the most, especially on mobile.