In March 2007, Marin's office released a report on the province's conduct in regards to the Ontario lottery retailer fraud scandal.

[10][11] A 2006 report for the Canadian Department of National Defence found Marin had created a dysfunctional workplace at his office during his tenure, with multiple complaints and staff departures.

[12] In 2010, the Toronto Star investigated human rights and labour complaints made by staff under Andre Marin's tenure.

[13] A number of complaints were filed against the ombudsman, the office and his management team with the Ontario Human Rights Tribunal and the union.

[13] In 2010, The Globe and Mail publicized some of the expenses Marin billed to taxpayers, including his personal grooming products, a $38 toothbrush and a $2,000 flat screen TV for his Ottawa home.

[19] On May 28, 2015, the Ontario Legislature voted to extend Marin's term as ombudsman until September 14 to allow him to wrap-up investigations.

[27] In 2020, Marin was hired by People's Party of Canada leader Maxime Bernier to represent him in a lawsuit filed against political strategist Warren Kinsella alleging Kinsella was hired by the Conservative Party of Canada to run a pre-election campaign of defamation against Bernier.