I feel like this is the fifth time I've said this: Comedy trailers are incredibly difficult to cut. When there's a really good one, like Ted, then everyone complains that all the good jokes were given away in the previews.
That's a rather poor excuse, since any random audience member has viewed enough comedy trailers that attracted and promise an uproariously good time without giving it all away, or falling flat. If your theory was correct, then I would argue most comedy movie trailers would fail to hook anyone enough to slap down the cash. You must look at the
content--what they're working with, and not lay
Ghostbusters' disastrous trailer responses (probably top 2 on an all-time trailer bad reaction list) at the feet of the editors.
Only time will tell how this film performs, but at the moment, for a film that's part of big budget franchise with cultural / name recognition, there's not much generating the kind a sweeping,
positive social media dialogue seen after the release of the teaser and full trailers for
Captain America: Civil War--a film which had much to live up to and deliver.
The only other approach is to just do some really broad strokes about the concept. This is especially true in the case of Paul Feig's movies, because so, so many of his jokes rely on slow-burn payoffs. I don't think any of his movies have had good trailers (the ones for Bridesmaids and Spy were particularly terrible), yet I can't think of a single bad thing he's directed or written / co-written.
Then, that's another potentially big problem:
Ghostbusters--as the culture understands it--was not a "slow burn payoff" type of humor in film; there were some dry wit moments and certainly snarky lines, but the humor was still direct and clever. If Feig is altering that template to fit his "reboot," then he might have more problems that he can imagine.
Again, its the
job of the trailer to convince audiences to see the film, not undersell it, or reveal (or omit) things that do not help the case of the film. That's how it works. Anything less cannot all be piled on the trailer alone.