The moral of the story, always listen to Gabe. Ok, and you can listen to Ryen Russillo, Steve Bulpett, Shira Springer, and sometimes even ESPN too. Just think twice about RealGM, ...and CelticsBlog for that matter.
We can go into a long, drawn out discussion on the reasons and value of this trade at some later point. However, I think it boils down to perspective: If you were looking for an immediate impact return for Walker, you are disappointed by this. If you were looking for a cap friendly, flexibility retaining, adding assets deal, then this deal is for you. So basically, beauty is in the eye of the beholder.