Yes, on net, based on its record of deterring great-power war in Europe, protecting member states, and enabling postwar stability and prosperity—though it is imperfect, has made costly errors, and looks very different depending on whether you are in Warsaw, Moscow, or the Global South.
Core Record and Achievements
NATO was created in 1949 as a collective defense pact (Article 5) explicitly to prevent Soviet domination of Western Europe after WWII. It succeeded at its primary job:
•No member has been conquered or subjected to large-scale conventional attack in 75+ years. The Soviet Union never rolled west; Russia has not attacked a NATO state. This is the central empirical fact. Europe’s longest stretch of great-power peace occurred under the NATO security umbrella, which also allowed massive demilitarization of national armies in favor of economic integration (EU, trade, welfare states).
•It anchored West Germany into the democratic West rather than leaving it as a neutral prize or revanchist actor. It later absorbed former Warsaw Pact states and Baltic countries that explicitly sought protection from Russian revanchism. Those states have higher growth, stronger institutions, and lower risk of irredentist war than the gray-zone countries left outside.
•Post-Cold War operations had mixed but non-zero positive results: ending the slaughter in Bosnia and Kosovo (however messy the aftermath), and the Article 5 invocation after 9/11. The alternative in the Balkans was continued ethnic cleansing and European freelancing.
•Nuclear and conventional deterrence raised the cost of revisionism. Russia’s wars have targeted non-members (Georgia 2008, Ukraine 2014/2022). That pattern is data, not coincidence.
Countries that lived under Soviet occupation or face Russian military pressure today (Poland, Baltics, Finland, Sweden) treat NATO membership as an existential good. Their revealed preference matters more than academic theorizing.
Real Criticisms and Failures
NATO is not a charity or a human-rights NGO:
•Mission creep and botched interventions: Libya 2011 turned a limited civilian-protection mandate into regime change and state collapse. Afghanistan was a long, expensive nation-building failure after the initial counter-terror phase. These damaged credibility and created refugee/migration blowback.
•Expansion debate: Realists (Mearsheimer et al.) argue that pushing toward Russia’s borders ignored balance-of-power realities and contributed to the current confrontation. This has partial merit—diplomatic arrogance and the failure to craft a durable post-Cold War settlement with Russia were real. It does not make Russia’s full-scale invasion of Ukraine “NATO’s fault”; Moscow’s imperial claims, refusal to accept sovereign neighbors, and prior wars predate the 2008 Bucharest language. Non-members get invaded; members do not.
•Burden-sharing and strategy: Many European members free-rode on U.S. capabilities for decades. Strategic incoherence (see Afghanistan exit, Libya) and bureaucratic bloat exist. It remains heavily dependent on American enablers.
•Perception outside the West: In much of the Global South, China, and of course Russia, NATO is viewed as the military arm of U.S. primacy or liberal hegemony—selective, hypocritical on international law, and a threat to multipolarity. That view is coherent from their interests even when it flatters authoritarians.
What the Counterfactuals Suggest
Absent NATO, Western Europe faced either permanent U.S. occupation guarantees on worse terms, re-nationalized armies and nuclear proliferation (Germany, etc.), or accommodation with Soviet/Russian power. Eastern Europe’s trajectory without the Article 5 option looks more like Ukraine’s or Belarus’s. “Just negotiate” has a poor track record with revisionist powers that reject the premise of equal sovereignty for smaller neighbors. Alliances are not unique to the West; they are how states have always sought security.
NATO is a force of good for its members and for the open societies that want to stay that way. It is a constraint or adversary for regimes that want spheres of influence enforced by force. Its value is conditional on remaining a defensive alliance with credible deterrence rather than an open-ended global policeman. The Ukraine war is the clearest current test: NATO’s existence has limited the war’s scope, armed a victim of aggression, and avoided direct great-power combat so far—exactly the outcome collective defense is supposed to produce.