One issue with the streaming service is that no one really knows how many viewers are watching original series, such as women-in-prison comedy "Orange" and the political drama "House of Cards."
Netflix isn't rated by Nielsen, the company that measures TV viewing, and executives have refused to release any viewership data whatsoever.
Some media outlets are describing "Orange" as a "smash." For all we know it could really be a dud.
The uncertainty is rankling many investors and media veterans, who argue that it's tough to figure out just how popular these shows really are, even if the Emmy nods for "House of Cards" last week make it clear Hollywood has accepted streaming series as viable programming.
But wait. It may be possible to at least formulate an idea of the viewership for "Orange," even if it just amounts to an educated guess. And, yes, a guess is all it is. But we did say educated.
First, let's consider that Netflix now claims about 30 million subscribers for its paid content. That makes it (as of earlier this year) just a shade larger than HBO, which has 28.8 million subscribers.
HBO's most popular show is the fantasy "Game of Thrones," which gathers an audience of more than 13 million.
We're guessing that "Orange" is nowhere near as popular as "Thrones." First, it's very early in the "Orange" life cycle, and "Thrones" has had years to build that audience.
Second, "Orange" is a dark comedy -- and, as the saying goes, satire is what closes on opening night.
"House of Cards" may have gotten 13 million viewers over time, but "Orange" won't.
A better pay-cable antecedent is probably "Weeds," the Showtime comedy overseen by Jenji Kohan, who's also the show runner of "Orange." "Weeds" drew fewer than 1 million viewers on opening night and, once all the various platforms were added up, was getting just north of 3 million viewers.
But Showtime has about 22 million subscribers, which makes it significantly smaller than Netflix.
So what's it all mean? Bottom line, "Orange" episodes will probably be seen by about 4 million viewers. Smash hit? Maybe not, but pretty decent for an outlet that wasn't even producing original series less than a year ago.
What does Netflix say? We asked a spokeswoman for help with our calculations, and she emailed back: "No guidance but thanks for asking."
That makes a kind of sense, as Netflix is, like HBO, selling subscriptions, not advertising.
One thing we do know, however: If and when Netflix does post some truly record-beating ratings, exact figures will suddenly materialize.
In a tweet, followed by a long news release. Bet on it.
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