Since I don't know you very well it is difficult to tell if you're being ironic or not. From one perspective your statement could be seen as highly ironic - Yglesias' major push on the Freeman critics being that they are operating in bad faith.
Assuming for the moment you weren't being ironic I wonder if you'd like to elaborate on why it is that you think good faith and sincerity matters in public discourse. You can read some views I posted on the subject here: http://bloggingheads.tv/forum/showthread.php?t=2712
For the record I generally agree that Yglesias, like most political commentators trying to make a living these days, often makes transparently bad faith arguments and that I generally ignore those and attempt to understand what he's really after and what point he's really trying to make. Sometimes he does try to cynically spin things. I've seen him walk a few things back when called on it though.