It’s bad if it takes longer to get a fiscal package through government than to cut interest rates (something more akin to the US government than the US government). Also because according to real business cycle theory a recession is the equilibrium reaction to an external shock – any stimulus will be inefficient.

It’s good because you can target areas of the economy that are struggling/spend in areas that provide the highest multiplier. Also the announcement is good by itself as it helps consumer confidence, which should by itself help stimulate domestic demand.

And then there’s the attractiveness of fiscal intervention if you’re concerned about a liquidity trap/ zero interest rate bound.

But generally I agree with you, I’m not a fan of using fiscal policy to fine-tune economic growth unless its a dire emergency. I don’t even think the US is necessarily in that situation yet (it’s only the fact that the problems originated in the credit markets, and thus monetary policy might prove ineffective, that might convince me otherwise)