I've been working with 3d for many years now, and have a lot of experience with it in the lab, so I was a bit confused by all the talk about how 3d was no good, or didn't add that much.
So I went to a theater and watched Resident Evil: apocalypse
Now, I understand.
When I got my first VR headset, the 3d didn't seem to work well, I was pretty dissapointed. I had to dial the depth down to super shallow, where the 3d effect was at it's weakest. At that point, it seemed almost pointless. I probably would have just taken off the glasses right there and walked away from 3d, but I had just spent a bunch of money on it (well for that time) and couldn't give up that easy.
So I kept using the 3d glasses a few hours a day. I kept messing with the depth settings, and noticed that over a week, I could set the depth higher and higher and still see clearly. At about 2 weeks of multi hour daily use, I could dial it up to 100% depth and see clearly.
Highways in driving simulators stretched out forever into the distance, 3d models looked like you could reach into the screen and touch them. The feeling of immersion was spectacular.
For a movie theater, they have to dial down convergence to where anyone can see it clearly the first 5 minutes you watch. This is why your theater screen looks 70 feet wide and 1 foot deep.
Once you are acclimatized to seeing 3d, and you can set convergence for YOUR eyes (only) you can get some really amazing depth effects that are light years beyond what the current theatrical movies are showing.