Yes, Bush's administration wrought havoc because he had some competent people on his team. Enough to matter, to orchestrate immense harm. And while he clearly isn't the sharpest tool in the shed, he's at least coherent most of the time and understood most of what was going on. Unlike Trump, who is often in fits of fanciful wonderment about well known things like a child. What was the most recent one? Shoot UV rays through someones chest or some dumb shit like that.
Trump, on the other hand, is just clearly extremely stupid, inept. He hires the wrong people, people who have no idea what they're doing (like Doctor Ben Carson for housing development? That dipshit from Texas for energy? Like what?), then quickly fires them and hires someone even more unqualified. He has left much of the government unstaffed, as it seems he just can't be bothered to do any real work. Not even delegate it to others.
So yea, the Trump admin's legacy will probably be that it spent its time spinning its wheels doing jack except for signing a tax giveaway to billionaires and corporations at the expense of the middle class and even the poor. Meanwhile, Bush's admin literally wrecked part of the world and insured massive terrorist organizations would grow for decades to come.