I think the damage done by Reagan was more long term such as getting much closer to the religious right and the deficit he started to run up.
Bush Jr did exactly what he was accused of doing. He willfully lied to get us into a war with Iraq with no forethought as to how it would end. He neglected Afghanistan to the point where it will take us much longer to get that mess settled and he ran up the deficit over 4$4 trillion dollars. Were it not for him, Obama would probably not be in office.
How's that working out BTW?