Military intervention is always blunt, but in the case of the Kosovo war the results were relatively benign (so far). The situation in Kosovo is still not resolved, but it's not warlike anymore. Milosovic was removed from power by the Serb people, which may not have been possible if he had not lost the war/given in to NATO demands, or if it hadn't happened and he was still able to pose as the great protector of the Kosovar Serbs.

Serbia is on the way to become a functioning democracy, Montenegro is a free country, a crisis in Macedonia spun off by the aftermath of the war was resolved diplomatically. So to employ Colman's rule, intervention didn't create a bigger mess than was there before. If there would have been a less painful way, I don't know.

Of course, this argument can fall apart if you look at the larger consequences of the war, which were that the Republican party of the USA drew all the wrong lessons from it and that it may have fueled a resurgent nationalism in Russia. But both of these relations are rather tenuous.