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Yes, conservative foreign policy is effective, because it sends a strong message to other nations that the United States will not tolerate threats or war from other nations. Conservatives believe in peace through strength. This definitely worked with Ronald Reagan, who dismantled the USSR by winning the arms race, and proving that communism is not tolerable.
Conservative foreign policy often seems to be to be isolationist, and when that gets us in trouble such as by ignoring injustice in the world or indirectly causing pain, the conservative foreign policy does a 180 degree turn into being overly eager to engage in war, which seems a very hypocritical stance. Very little diplomacy occurs in the gray areas in between.