That is irrelevant. It doesn't matter what they draw on a graph, they can change that all they want. I don't care if mtgox shows only 10% under spot bids and 10% over spot asks if they at the same time have the entire depth table available. But that's not the case, not only they do not draw all the bids and asks they don't even provide the depth table.

Plus if you look at the depth of tradehill on bitcoincharts instead you can see a perfect picture of how the supply and demand looks like.