The phrase "are largely regarded" is correct and usable in written English.
It can be used when discussing how something is perceived or viewed by a significant number of people or experts.
Example: "These theories are largely regarded as foundational in the field of psychology."
Alternatives: "are mostly seen as" or "are generally considered to be".
On the other hand, Atlanta has had an up-and-down relationship with its pro football team, and the fans are largely regarded as fair-weather ones.
Referring to the relationship between the IndyCar Series and International Speedway, whose tracks are largely regarded as stock-car sites, Bernard said, "I'm not sure we both have the same objective".
The tariffs are largely regarded as one key element in a looming trade war between the two superpowers.
Photovoltaic stand-alone systems are largely regarded as a viable option for decentralized rural electrification in developing countries.
Organosulfonates (RSO3−) are largely regarded as poor ligands by coordination chemists, and have typically been employed as 'non coordinating' anions in past synthetic and structural work.
In spite of what are largely regarded as fringe views, however, he's amassed a massive viewership, and even scored an interview with Donald Trump in the lead up to the 2016 election.
Once popular with Israeli officials, Mr. Barghouti is largely regarded in Israel now simply as a terrorist.
In the States, he is largely regarded as an amusing sideshow whose apocalyptic writings attract vulnerable people looking for answers.
When McNabb broke his ankle Nov. 17, Philadelphia was thrust into a panic, because the Eagles, until that point, were largely regarded as a one-man team.
Under Ms. Beckett's direction, Mr. Bishins makes Miller — the author of "Tropic of Cancer," who is largely regarded as a misogynist these days — appealingly fierce.
Although William Grimes gave the restaurant two stars in The New York Times, it was largely regarded as a prelude to a grander restaurant to come.
