Actually, I disagree about his possible failures in foreign policy.
To start with, Saddam was just going nuts. Iraq was descending into chaos, with Iraqi oil money flowing to corrupt politicians everywhere to violate the embargo. Even Saddam himself thought that he was still developing WMDs, which Iraq was still capable to do, but nobody else in Iraq wanted to do.
And Iran was poised to exploit the situation terribly, to get a monopoly over much of the world’s oil, possibly to invade and conquer Iraq, and then Saudi Arabia.
Worse and worse, the Khan nuclear proliferation ring in Pakistan was providing technology for decentralized development of “Muslim bombs”, a deal involving both Libya and Egypt, and probably Saudi. Pakistan wanted to attack India with them, and India was more than willing to respond.
And, of course, all the gang wanted to annihilate Israel, possibly with nukes, despite Israel having over 200 of them, which would cause a medium sized nuclear war that would most certainly affect the US, because of the isotopic jet stream dump over middle America (we discovered during atmospheric testing, that dropped copious amounts of strontium-90 contamination over the Midwest region.)
The big failure was that W. Bush failed to conduct nation building in Afghanistan, like he did in Iraq. Had he done so, we could have exited them long ago, and they would be far more stable. This is because we would have cut off the border between Afghanistan and Pakistan, keeping the Pakis bottled up to savage each other.
Bush worked very hard to support Perv in Pak, because he wanted to unite his fractured country under a central government. An essential thing to stop them from being terrorist training central. However, at the start his power was just a tad greater than all the other factions, so it was a very long row to hoe.
All told, his plate was full with foreign policy, so he needed somebody with common sense and conservative values to run his domestic policy. And he didn’t.
I think Bush gave up when the Republicans in Congress didn’t back him on Social Security reform, he probably figured, “What’s the point?”