Paul Feig’s new “Ghostbusters” movie has been one of the most scrutinized of the year, with a flood of pre-release debate over the need for an update. Then there’s that much-disliked trailer.

But Ivan Reitman, the mastermind behind the original and a guiding force on the new film, has a message: patience and understanding.

“Many of the people writing furiously about it were at an age, maybe 7 or 8 or 9, when ‘Ghostbusters’ was the coolest thing they ever experienced. And now there’s this two-minute trailer and how can that stand up to it?” he said. “It’s not so much that the trailer was bad. The trailer was fine. It just can’t stand up to more than 25 years of personal experience.”

That, he believes, will change upon release. “That’s why people have to see it. Word will be out quickly.”

Reitman has been heading up Ghost Corp., the branding-based production company, for a variety of Ghostbusters projects, including a potential Channing Tatum film. Included in that effort is a “Ghostbusters” VR experience; the director was speaking to The Times during its launch at Madame Tussaud’s recently. Reitman, who directed the first two “Ghostbusters” films, was originally developing a third movie with the original cast before plans went awry in part due to Bill Murray’s unpredictability and the death of original star and co-writer Harold Ramis.

The filmmaker says he has no regrets about not being involved in the new movie, which arrives in theaters July 15. “You have to pass it on,” he said. “Paul did some brilliant things, particularly in the four main characters. I’m confident when you see them interacting with each other and you think of what Bill and Harold and Sigourney and Dan did in those two movies, audiences will respond in the same way.”

Early tracking has put the opening for the new film in the $40 million to $50 million range. That wouldn’t be a huge amount - it would barely be above the per-screen average of the first film, which had a lot less opening-weekend awareness - but in a soft summer it wouldn’t be bad either. An opening of $45 million, for instance, would be the eighth-highest of the year and the second-highest of any non-animated or superhero film.