I think the issue is not a matter of "building vs. house". That would be absurd. The issue is over many of the attitudes and false beliefs conveyed by those who attend housees and, conversely, those who attend buildings.
Personally, I think there is validity to both sides of this. I am speaking in generalities, but many of the "house church movement" do indeed display hypocrisy by looking down on the "less enlightened" because they are too "traditional". On the other hand, I have seen many "building-goers" who claim "No, we don't hold to these traditions", and yet they do not take the extra step of actually proving it through their actions. I find both equally wrong.