The phrase "already compelling" is correct and usable in written English.
It can be used to describe something that is persuasive or interesting at a point in time that is earlier than expected.
Example: "The evidence presented in the report is already compelling enough to warrant further investigation."
Alternatives: "already persuasive" or "already intriguing".
Their duel, while not quite worthy of the Victorian giants, is already compelling.
Other doctors see no need for further study of MammoSite, saying the practical evidence is already compelling.
While she does not yet shape the role in the extraordinary arc of character that made Ms. Makarova and Ms. Seymour amazing, she is already compelling.
LaBossiere claims that by requiring that we fund Medicare, Medicaid and Social Security, the state is already "compelling us to buy what amounts to health and retirement insurance".
The new technologies are already compelling consumers to rethink what it means to collect recordings.
The evidence that the New Jersey Democrat improperly used his office to help Dr. Melgen was already compelling on Saturday.
The company already compels them to broadcast editorials and commentaries favorable to Mr. Bush and his policies.
It is this illusion that captures us, and when the trick is revealed, Haas has already compelled us to see our cities in a different way.
Even that step raises the cost of making a donation, a circumstance that has already compelled a handful of companies, including Cisco Systems and the Oracle Corporation, to suspend matching gifts to some organizations.
In which case she will have to marry her current beau, a prospect that has already compelled her ex-beau, Remy, to produce his deepest glower of this series.
But the Energiewende, as Germans call the energy U-turn, has already produced one certainty: the country's four giant power companies, which were already compelled last year to shut eight of their nuclear plants for good, are among the big losers.
