I think you mean to say he was rational and had "compassion". He wasn't well informed and was overruled by Cheney.
...which is to say, I don't have to agree with him to accept him... with Trump, it not a matter of agreement (agree with what, exactly?) it is a matter of him failing to earn any respect whatsoever, and his squandering of any remaining benefit of the doubt one might grant anyone else.
W was an embarrassment who couldn't speak well in public. He was in way over his head and his VP had unprecedented power in the White House. He sucked ass as a "manager"... the role that he was supposed to excel in. He placed incompetent people into positions of high power and the cost was dear. Of course, that took several years to come to fruition.
Trump, not even 5 months into his Presidency, has surpassed W's inadequacy as a leader.
The big difference is at least George W. Bush wasn't a pathological lying sociopath. And W genuinely wanted the world to be better, even if he didn't have a clue the damage he'd do. Trump doesn't give a fuck about anything but his family... and when I say family, I mean a couple sons and one daughter. And worst off, while W was president, bravado wasn't his thing. With the exception of the "Mission Accomplished" deal, he was a humble President. Trump, wants everyone to know he is the greatest... and most of those of his national leading peers knows he is the opposite.