This is a question I should approach carefully, as it involves a genuine political and philosophical value judgment rather than a factual matter that can be settled by looking something up. Let me share some perspective rather than a web search, since this isn't really a question with a factual answer to look up—it's a matter of political judgment where reasonable people disagree.
The case that NATO is beneficial:
•It's credited by supporters with deterring Soviet aggression during the Cold War and maintaining peace among member states (no NATO member has fought another).
•It provides collective security that smaller European nations likely couldn't achieve alone, potentially deterring Russian aggression against members (as arguably seen in restraint toward NATO members vs. the invasion of non-member Ukraine).
•It's enabled cooperation on counterterrorism, humanitarian missions, and crisis response.
•Many Eastern European countries actively sought membership, viewing it as protection and a marker of Western integration.
The case for skepticism or criticism:
•Critics argue NATO expansion eastward after the Cold War provoked Russian insecurity and contributed to tensions leading to conflicts like the Ukraine war—though this is hotly contested.
•Some argue NATO has been used as a vehicle for U.S. military interventionism beyond its original defensive purpose (e.g., Libya 2011, which some view as having caused more harm than good).
•There are questions about burden-sharing, with some members historically underfunding defense while relying on others (particularly the U.S.).
•Some view large military alliances generally as perpetuating arms races and militarization rather than genuine peace-building.
Why this is fundamentally a values question:
Whether NATO is "good" depends heavily on:
•How you weigh deterrence/stability versus the risks of military alliances and escalation
•Your view on spheres of influence and whether states have a right to object to neighboring alliances
•How you assess specific interventions (humanitarian success vs. unintended consequences)
•National perspective—views differ significantly between, say, Polish, American, Russian, or non-aligned country viewpoints
I'd encourage you to weigh these considerations based on your own values about security, sovereignty, and international relations rather than looking for a definitive verdict, since this is ultimately a contested political judgment rather than a settled fact. If you want, I'm happy to dig deeper into any specific aspect—like a particular NATO action, expansion debate, or historical episode—where I could look up more concrete details.