I'm in two minds about this one. On one hand we now have the tools to add constructive criticism in the form of a single icon, but if I mark a post as dumb then im likely to comment and follow it up as to why. Imo there isn't any reason for me not to give a valid reason as to why I would negitively mark a post as long as it helps the topic flow. An icon in itself only labels the post with your opinion but doesnt give a reason as to why without posting. On the other hand, I believe that this is probably one of the best forums I have ever enjoyed with a truly excellent community. Although the tools could he abused I think it won't be a problem due to the overall quality member base. I think it will be how the community use (or abuse) the new system will determine its overall usefulness.