I think the discussion based around HALO3's resolution is interesting, as it gives us a better understanding around how devs are using the resources on Xenos to achieve what they are. If there are devs that are rendering at lower than 720p, it begs the question why and at what benefit. After all, this is a technical forum, so you can't really blame us for being curious.
At the end of the day though, and from a gamer perspective, one could really care less if the native resolution is 600p or actual 720p as it will surely look and play great. I don't think hostility is at all needed.