The phrase "a series of flawed" is correct and usable in written English.
It can be used to describe multiple instances or examples that have imperfections or shortcomings.
Example: "The report highlighted a series of flawed assumptions that led to inaccurate conclusions."
Alternatives: "a number of defective" or "a collection of imperfect".
The original story of the Little Prince is about acquiring wisdom, as the boy leaves home and his friend, the rose, to visit other asteroids inhabited by a series of flawed figures before arriving on Earth.
This too comes from a series of flawed Supreme Court decisions that put far too much faith in the ability of K9 drug detection teams, which tend to have alarming rates of error.
Putin soon hitched himself to the first of a series of flawed, small-d democrats, who would propel him to power.
Florida, which switched to lethal injections after a series of flawed executions in its electric chair, has had trouble with another execution.
The EU first imposed sanctions against Belarus in 2004, steadily extending them to more individuals and organisations following a series of flawed elections that returned Lukashenko and his parliamentary supporters to power in successive landslides.
His alarming conclusion: the wrongful convictions were not idiosyncratic but resulted from a series of flawed practices that the courts rely on every day, namely, false and coerced confessions, questionable eyewitness procedures, invalid forensic testimony and corrupt statements by jailhouse informers.
It identified a series of flaws in care for those nearing the end of their lives.
(Charlie Brooker described Madeley's arguments as "a series of flaws held together by consonants").
Government and industry officials ultimately blamed the event on a series of flaws compounding other flaws, including neglected transmission lines, careless system operators and faulty computer software.
A series of flaws in the initiative, which became known as the cash-for-ash scheme, exposed taxpayers to huge costs.
If you sit around devising elegant and complex strategies and then try to execute them through a series of flaw-less decisions, you're doomed.
