"largely deemed" is a correct and usable phrase in written English.
It means that something is generally considered or thought of in a specific way. Example: The new policy was largely deemed a success by both employees and management. In this sentence, "largely deemed" is used to indicate that the majority of people see the new policy as successful. It can be used in any situation where something is widely believed or perceived in a certain way.
In July elections, which were largely deemed free and fair by Western observers, Kurmanbek Bakiyev was chosen president.
Last year more than 60 percent of Iraqis turned out to vote in parliamentary elections, which were largely deemed free and fair by international monitors.
While state-media supported Fidesz communications have angered the international community, which has largely deemed the border fence a failure, at home the anti-migrant rhetoric has chimed with voters and helped the party shore up its falling support.
Although opposition groups criticized the process as flawed, the election was largely deemed free and fair by international monitors, who noted only isolated procedural violations and instances of fraud.
Spotify broke the news on Twitter, teasing: "Who's jamming to that nasty groove?" Trump's vicious aside, made when Clinton was discussing her plan to add more money to the social security program, is largely deemed to have undermined his earlier assertion in the debate, that "nobody has more respect for women than me".
Although Prime Minister Serzh Sarkisyan defeated Ter-Petrossian in an election that international observers largely deemed free and fair, a number of sizable pro-opposition protests held in Yerevan criticized the integrity of the vote and the validity of the election's outcome.
However, despite largely deeming all health-related information during pregnancy important to report at the ANC to help ensure a good outcome, they could not always recall or give exact details of what substances they had used.
Blackface and minstrel shows have largely been deemed unacceptable and racist by most.
In Central Europe, the ecological role of fire is largely neglected and deemed unimportant.
It was neglected in biological research and, being beyond the physician's ministrations, was deemed largely irrelevant by medical practice.
Jonathan was victorious in the country's 2011 presidential election, which was deemed largely free and fair by international observers.
