To be fair...is there any nation in any major war that has come as close to following the Geneva convention as we have?

To be fair, you're not following the Geneva convention in this case, so your point is moot .

In all honesty, I have no evidence that, in general, the US is worse (or better) at following the Geneva Convention than any other nation involved in a conflict. I assume that (based on the fact that the US is a civilised nation), the US would follow it pretty closely.