@cicerone imposter,
I agree that G.W. Bush erred badly when he undertook nation building campaigns in both Iraq and Afghanistan, and believe the question of whether we should have ever taken down the Saddam regime in Iraq is a very debatable point. However, Bush is gone now and the current President has avidly embraced the nation building campaigh in Afghanistan, saying it was the "right" war, but so far appears to be making a far worse muck up of it than did Bush in Iraq.
The Medicare drug plan did address a very real change in effective medical care - the great advances in the treatment of degenerative diseases of the aged through new pharmaceuticals. It was very costly as you say..., and the proposal was widely supported by Democrats in the Congress. Interestingly the current administration bought off the drug companies by assuring them of continued high reimbursemment rates as a condition of their support for Obamacare. I agree that Bush should have accompanied the drug benefit with a delay in the age of eligibility of Medicare to reflect current demographic reality.
Bush also made a serious, if ineffectual, attempt to restructure Social Security, something that was vigorously and categorically resisted by Democrats and still is today. The last real reforme were the delays in entitlement ages introduced by President Reagan. More are clearly needed,
I do not agree that Bush singlehandedly "created the great recession" as you say. In the first place this was a nearly world wide event that involved varying cause in many countries, but which were united in excessive levels of public debt, over regulated labor markets, under regulated banks , and excessive government subsidies to some market areas (in our cases home mortgages). In the second the roots of these issues go a long way back in every country. Finally there was a cyclic element to the recession -- it has happened before and it will happen again.