Well every republican voter I know is pretty pissed off at the spending that occurred under Bush. Some to the point of calling him a bad president, but not all.
The basic argument for the spending is obviously that those in charge felt it necessary, and put safety above all else. "Spend now or spend far more later".
To me, Bush was damned if he did and damned if he didn't. Had he not used all the resources available to him to prevent terrorist attacks, and had a repeat performance of 9/11, it would be political suicide. That said, I'm disappointed myself, but not to the point of considering him among the worst of the worst. People seem to forget the evidence presented of WMD's, and Hussein's own history of biological weapons. Pretty convenient.
Its also a bit odd to me to pretend that a democrat would not have spent similar money, even if in different fields. The global warming thing became a runaway train in the press, and probably would have spawned significant damage if mandates and spending grants were given out. That too would be ridiculous to some, less ridiculous to others, the same way defense spending is now.
With all the attention given to "pork" these days, its my hope that both sides of the isle will get with the program. Hopefully we can get the "Google for government" people are talking about.