Sure if you know initial sales number compared to previous initial sales numbers.
But the only thing known is if/when they sell out...
It's like judging Apple success by the length of line ups for a new iPhone. iPhone lineups have largely disappeared but iPhone success hasn't.
Also whichever outcome happens, there is a contingent on this forum that will view it negatively either way.
Sells out fast: Inadequate stocks from (purely made up) reasons: manufacturing issues, some kind of marketing ploy to hype it going out of stocks, holding back supply to sell old cards...
Doesn't sell out: Card is a failure that the consumer has no interest in.