Bush trashed the economy and bailed out the big banks. When Obama came into office he attached the caveat that the banks had to pay us back, Bush just gave them the money, no strings attached. But now everyone blames Obama for the bank bailout. It was already a law passed by Congress when Obama took office.
Obama kept the economy - and likely the entire world's economy - from going off the cliff. We'd be in the Greater Depression if McCain had been elected.