@tanstaafl: Sure, but you don't scream at them on the way out. You let them know that you preferred their old style and give them a chance to change it back, and if not, you terminate your relationship.
Not to stretch that metaphor out, but really, so much of what's been said here is violating the very first rule of the forums, which is something to the effect of "be nice." Rorie's posted earlier that feedback is being gathered, so maybe we can all do our best to civilly post about what we'd like changed, instead of verbally assaulting the new site? It's not that hard, and shouldn't really have to be said in the first place.
Fair enough, I genuinely love the staff the make Giantbomb such an awesome place, and the community as well.. All this is basically breaking my heart and comes from a place of deep respect, but at the same time it's like being betrayed by someone you had implicit trust in. Sorry to any feelings that may have been hurt, but the criticism is still real if somewhat overly emotional.