I call bullshit on all of this. Yes, there will always be criticism, but I remember most Americans rallying around Bush post-9/11 when he had a shot to unify the country toward a common goal. He blew that opportunity with Iraq, the Patriot Act and many other missteps.
Contrast that with Obama, people have been shitting on him before he even entered office. After a few weeks he was already a failure, compared to Carter, etc.
No, the treatment is not the same. There's clearly some underlying hate toward Obama, fueled no doubt by the Rovian tactics before he entered office. Bush's criticisms were largely due to his performance, not because of some bs about what people *thought* he was (Marxist, Socialist, Terrorist, Arab, Muslim, etc. etc.).
But if that makes the right feel better, fine. I think many of the comments about Bush were equally histrionic back in the day, and to me there's no excuse for any of it. It's like a bunch of screaming children trying to out-yell the other guy.