"a source of criticism" is a correct and usable phrase in written English.
It can be used to describe something or someone that is often the subject of criticism or negative feedback. Example: The policy of restricting employee breaks has become a source of criticism among workers.
The whistle-blowers often wait for months, isolated and bored, in motel rooms near their detained ships, a source of criticism from seafarers' advocates.
Ms. McMahon's tenure running the wrestling enterprise has become a source of criticism in her increasingly acrimonious campaign against her Democratic opponent, Richard Blumenthal, Connecticut's attorney general.
His provocative stance regarding Iran's nuclear program was also a source of criticism among portions of the country's pragmatic conservative leadership.
The existence of the hole the rogue developer was trying to exploit is widely known and has been a source of criticism of Google.
New York's liberal establishment has been largely neutralized as a source of criticism because he has staked out a progressive role, not only in individual cases, but also on causes like increasing state financing for lawyers who represent poor people.
Tebow's accuracy has been a source of criticism in the N.F.L., but he completed 66.4 percent of his passes in college and as a senior averaged 13.6 yards per completion.
Still, the fact that the United States continues to imprison men long since designated for potential transfer is a source of growing criticism.
But for lawmakers, the attention surrounding last summer's trip — thanks to reports of a skinny-dipping Kansas lawmaker who was part of the delegation — has cast an unwanted spotlight once again on the practice of private groups paying for foreign travel, a source of frequent criticism in the past.
In a diplomatic breakthrough that is likely to help the Obama administration close the Guantánamo detention camp, Portugal said this week that it was willing to resettle some detainees and urged other European countries to accept prisoners remaining at the camp, which has been a source of international criticism for nearly seven years.
Wenner's stake in Rolling Stone itself is now up for sale, and it remains unclear how the magazine which, in addition to losing credibility as a source of unbiased criticism, was catastrophically slow to adapt to digital platforms will be reborn under new leadership.
He's also called for police in the nation's cities to return to using controversial "stop-and-frisk" programs, a source of intense criticism against law enforcement in recent years.
