It looks pretty bad
https://youtu.be/PTngv5MmtXo?t=105
They're admittedly pretty cagey with the parts they're willing to show, but the parts they did show look fine to me. Are you referring to the parts when they showed the 3d mask overlay on top of the characters?
The motion lines up with the words more or less but it lacks any sort of emotion or emphasis like you'd see with real actors
Seems legit lol, nothing to brush under the rug definitely.
> Notably, the original actors recorded their own dialogues in English in a sound booth — Flawless AI's technology merely altered the movements of their lips in the movie.