Your argument would work only if Bungie would have been the first developer releasing such a game, but this whole thread is full of dozens of other high profile games, some of these X360 launch titles, others PS3 flagship games. Letting them get away with this has justified this practice already and made the issue irrelevant.
How is it "letting them get away with it"? The true resolutions have been posted for these games, and regardless it was only fairly recently that we had a method for consistently and accurately
proving the actual resolution of some games. Most reviewers and interviewers probably just didn't know.
Halo3 will obviously draw more attention due to the fact it's the most popular FPS game on the planet by a wide margin, so the attraction from the more mainstream press on this issue is understandable. Also, we have the method now beforehand - most other games have been out for months/years before we discovered their true res.
So...is there significant fallout? No, the vast, vast majority of comments I read are along the lines of "I don't care", which further makes me scratch my head about how this nebulous army of "fanboys" could have affected the reviews or sales of Halo3 in any way if the true resolution was known weeks beforehand.
Why is 640p vs 720p a "PR nightmare", but the strong suspicion (and eventually confirmed) that it would have no AA isn't? When people found that out, yes - there was discussion on technical boards and some people were dissapointed....and?
Do you actually believe the majority of Halo3 players could even tell you what's the resolution most 360 games run in?
Edit: and it's very disappointing to see Bungie getting singled out on Beyond3D as well just because of some people's platform preferences.
How many people are doing that, really? It's Halo3, of course people are going to single out this game right in its first week of release, especially considering it's sold more in that time than most - if not all - 360 games to date.
Not to mention that anything beyond the technical aspects of this issue just doesn't belong here anyway.
Once the facts are known about the true resolution, then naturally the discussion will slightly deviate to discuss _why_ the decision was made to go this route, and additionally why Bungie decided to release screenshots obfuscating the issue.