This is definitely funny, but it seems a bit petty.
I think people are over-exaggerating his fallacies and undermining his accomplishments. He had a lot of things thrown at him during his presidency that were out of his control. There are many areas in which he could've done a better job, but that's true of any president.
His biggest mistake was the initiation of the war in Iraq. Whether this mistake was due to faulty intelligence or a personal vendetta is irrelevant. The responsibility lies with him; he should have never taken us into there. However, I don't believe that the calamity that ensued afterwards should be a black mark against him. The unforeseen difficulties that we faced forced us to stay there. In fact, they are still forcing us to remain in Iraq. You can call Bush a catalyst, but don't say that he should've seen this coming. Remember, only hindsight is 20/20.
Just so I'm not accused of lunging at the opportunity to defend him, I would like to state that, while I used to consider myself as a Republican, I now think of myself as a conservative independent. What I'm trying to say is that I'm not a blind Bush-supporter. I have no emotional ties to the man, nor do I have a particularly biased opinion of him.
Again, despite its puerile nature, this event is pretty funny.