Short answer: Many historians and analysts judge Barack Obama to have been an above‑average president — with major accomplishments and also notable criticisms. Whether you call him “good” depends on which outcomes and values you prioritize.

Summary of major accomplishments people cite
- Economy and jobs: He inherited the 2008–09 financial crisis and a deep recession and presided over a long recovery: unemployment fell substantially, millions of jobs were added, and the housing and financial systems were stabilized.  
- Health care: The Affordable Care Act (Obamacare) greatly expanded health insurance access (tens of millions gained coverage), prohibited denial for preexisting conditions, and established marketplaces and Medicaid expansion in participating states.  
- Foreign policy wins: Oversaw the operation that killed Osama bin Laden, led multilateral diplomacy on the Iran nuclear deal, and helped negotiate the Paris climate agreement. He also normalized relations with Cuba.  
- Climate and environment: Strengthened fuel‑efficiency and emissions rules, used executive action to push climate policy, and helped raise global commitments at Paris.  
- Judicial appointments and institutions: Appointed two Supreme Court justices (Sotomayor, Kagan) and many federal judges, shaping the judiciary for decades.  
- Civil rights and social policy: Advanced LGBT rights (supported same‑sex marriage publicly), implemented DACA to protect many undocumented youth, and pushed criminal‑justice reform initiatives.  
- Symbolic/soft power: As the first African‑American president he had substantial symbolic impact on U.S. politics and civic life.

Common criticisms and limitations
- Partisan polarization: Polarization increased during his terms; Democrats and Republicans grew more divided, and many critics say he did not sufficiently bridge the gap.  
- Foreign policy controversies: Critics fault his administration’s handling of Syria (decisions not to intervene militarily), continued use of drone strikes (and civilian casualties), and the ultimately limited outcomes of some diplomatic efforts (e.g., Iran deal opponents and later U.S. withdrawal from the agreement under a successor).  
- Health‑care shortcomings: The ACA expanded coverage but left gaps — premiums and deductibles rose in some markets, not all states adopted Medicaid expansion, and it did not contain a public option or move to universal coverage.  
- Immigration: He implemented DACA but was criticized for high numbers of deportations earlier in his presidency. He also failed to pass comprehensive immigration reform.  
- Use of executive power: Some conservatives criticized his use of executive actions and administrative rulemaking; some progressives argued he relied too much on executive action rather than pushing harder in Congress.  
- Guantanamo and surveillance: Guantanamo remained open; critics say his administration did not do enough to end it. Civil‑liberties advocates criticized continued surveillance and some national‑security policies.

How historians and the public view him
- Historians’ rankings tend to place him in the above‑average tier; he often ranks behind transformative presidents but ahead of poorly rated ones.  
- Public opinion is mixed but generally favorable: he left office with reasonably strong approval ratings, though partisan perceptions are highly polarized.

Context matters
- A president’s options are constrained by Congress, the courts, global events, and institutional limits. Obama’s major domestic achievement (the ACA) required a Democratic Congress; when Congress was Republican‑controlled he faced strong legislative limits.
- Evaluations often depend on whether you prioritize economic recovery and coalition‑building, social policy and rights, or a more assertive foreign policy and faster systemic change.

Bottom line
- Many view Obama as a consequential, competent, and pragmatic president who achieved significant policy changes (especially health care and economic stabilization) and improved America’s global standing in many areas.  
- At the same time, there are real critiques—especially on foreign policy choices, limits of reform, and his inability to reduce political polarization—that temper a uniformly positive verdict.

If you want, I can:
- Give a shorter “for/against” list tailored to a particular issue (economy, foreign policy, health care), or  
- Summarize how historians rank him compared with other presidents, or  
- Provide data (unemployment, jobs added, people insured under ACA, approval ratings) with sources. Which would you prefer?
