I think doing away with the thumbs down voting was a terrible idea. What easier way is there to indicate a disagreement with a post than a simple and quick click of the mouse?
It also points out when someone may be giving bad or incorrect information, indicated by a large number of thumbs down.
I completely fail to see how this was ever a "problem" that needed to be remedied. So now we can all still agree with each other with a thumbs up, but God forbid that we should ever actually show a disagreement with a thumbs down. That would be horrifying.
Kumbaya