My point in mentioning Star Wars: TPM is that a movie can suck in spite of being a blockbuster. And the Da Vinci Code is hardly a blockbuster along the lines of SW:TPM. BO failure? Certainly not. But a 57% drop off is, in spite of your protestations, particularly poor. Especially when the 2nd weekend, not the first, is the holiday weekend. Given a normal Sunday, that's about a 63% drop-off.
Of big-release movies, these were those that were worse since 1980, out of about 2000 major releases:
Doom, 72.7%
The Adventures of Pluto Nash, 70.8%
Hulk, 69.7%
Elektra, 69%
Pokemon 2000, 68.3%
Final Fantasy, 67.9%
Timeline, 67.7%
Alien v. Predator, 67.6%
The Village, 67.5%
Pokemon 3: 67.1%
Mary Shelley's Frankenstein, 66.8
Matrix: Revolutions, 66%
Battlefield Earth, 66%
Alexander, 65%
Solaris, 65%
Freddie Got Fingered, 64.5%
The Messenger (Joan of Arc), 64.2%
Dutch, 64.1%
Critters 2: The Main Course, 64%
Aeon Flux, 64%
Freddie v. Jason, 63.9%
Batman and Robin, 63.3%
2 Fast 2 Furious, 63%
Hardly a distinguished list. Notice that, with the exception of some of the last several, they were all "built to crash": 2nd-tier comic book cult favorites and slasher movies.
I'm not going to beat this dead horse much longer.
The movie smashed all global records for an opening. It set records everywhere. If it closed right now, it would still be one of the highest grossing films in history.
It's perfectly fine for you to assail the content of the movie. Lord knows, it's only been done here in about 1000 threads so far.
If you want to pretend that nobody is watching it or that it will close in the next few days because of empty theaters, I guess I'm okay with that. That's your opinion and this place is all about opinions.