I would say that the bombing by Nato was criminal in itself too, since it lasted for so long, and killed a lot of people/destroyed massive amounts of infrastructure. Also the mass murders that were reported by western media turned out to have been grossly exagerated (comparing alleged murders in the scale of hundreds of thousants, to less than ten thousant, is indeed an exageration, and moreover the area of Kossovo was in civil war for a while; compare the numbers of dead with those in Iraq with the insurgency, which are in the same scale).
The fact that the croatian leader wasnt sent to the Hague also weakened the argument for equality.
I would think that Milosevic wasnt entirely worse than Bush or Blair; it is just that Serbia is clearly less democratic than Usa/Uk, and so it seems that it is more quilty. Definately there would never be militia and small paramilitary groups acting for Usa and Uk as in the case of Serbia during the wars in ex Yugoslavia, however there isnt much difference in the case of uncontrolled conflict in Iraq. Also Kossovo is/was actually part of Serbia, and so it can be seen as an inner conflict.
Moreover the Ramboye (spelling?) treaty would aska lot more of Serbia if it was put to use, than what was agreed to in the end of the bombings (for example nato troops didnt get any access in the rest of Serbia, whereas under the Ramboye plan they would).