The truth is, with the possible exception of Jimmy Carter coupled with an irresponsible Democratically controlled Congress, no president has 'wrecked' the economy. The fluctuations within any given administration can be quite dramatic as this graph shows:
MISERY INDEX 1948 TO PRESENT
Bill Clinton's administration did quite well actually, but he benefitted from the economy coming out of a moderately deep recession at the time he took office coupled with having a responsible GOP controlled Congress for six of his eight years. Even considering 9/11, the Iraq war, and a much higher than average number of natural disasters, GWB has done pretty well considering that he has been saddled with an irresponsible GOP controlled Congress for 2 years and an equally irresponsible Democratically controlled Congress for the last 2. He gets the credit for pushing tax cuts that provided good economic stimulus, but he can't be excused for his role in encouraging some bad legislation and signing irresponsible spending bills though.
All in all no President can control global influences outside their authority and as the graph shows, all administrations incur the ups and downs of these.
Playing the 'whose is blackest' game serves no good purpose. It is worth looking at which candidate's policies are likely to have the most positive effect to reduce the misery index in the next four years, however.