cheap impressions are the easiest way to dress up a fake ROAS.
One of the positive replies reported a 6x but admitted it includes view-through. In a channel where everyone else sees dirt-cheap impressions and zero conversions, view-through is the metric that would hand you a 6 anyway. Low CPMs inflate view-through attribution harder than anything out there, since you're buying more impressions for the pixel to claim credit on.
The other positive reply is the same shape without a number. Worse conversion rate, much cheaper traffic, better ROI. That math only holds if those conversions are click-attributed.
always rerun the numbers click-only. i've been burned by blended reporting on Meta more times than I can count. if either of these survives that filter, it's the most useful number in the whole thread. 👀