Then who is? His "high profile screwups" are all with Americans involved ... JJ, oh he should have told him the clock was running. SVB, oh the great Doctor RECREATED a video where he developed scenarios that proved the call was wrong, even though Dr. Dave did not make any conclusion of his own per my memory AND the fact that Marcel was in the "correct position" to view the shot and DID review the ACTUAL video before finalizing the call. Then you have Sky questioning a double hit call, where the commentators seemed to agree with Marcel. And then the Yapp incident, where the 9 ball did not move or the movement would have defied the laws of physics IF it happened.
All the Dr. Know opinions that the 9 ball moved, but no slow mo, mo jo or whatever showed the cue stick touching the 9 ball.
You forgot when he unilaterally decided that a miscue was a foul, which WPA had to correct with a rule clarification last month.
Michaela Tabb (not an American, by the way - not sure what your issue is there) set the gold standard for pool referees. Hopefully Marcel can approach her level some day.