The preferred unit of measurement in maya are centimeters, the preferred unit of measurement in vue are meters. You need to set in the xstream preferences dialog that one maya unit corresponds to 1m, meaning that you have a scaling factor of 1:100. The automated scaling seems just not to be working and you have to do it manually.
So for example in the film I'm doing the scene is 1500x1500 maya units, and should be perceived by vue as 1.5x1.5km and not 15x15 meters.
You then need to go to the vue atmosphere editor and adjust the atmosphere scaling number so it fits your scene in terms of fog and haze and all that. For that you need to do a few test renders, aka half a day.
In terms of camera. Yes it is initially off, but that can easily fixed by putting the camera into a container (so the container has the translation information, because the camera is always off by the same amount). But that was a really easy fix that only took me 5 minutes.
Granted, it also took me more than half a day for the atmospher, but then again I think of myself as particularly slow, which I realize I'm not.
I just looked at some of your stuff and it looks amazing. I also see that you're quite the expert on vue. I was wondering if I could ask you some questions about best practices (so I don't have to do all the mistakes you've done , because on one hand I'm running into a lot of problems lately which really delays the animation project I'm working on at the moment. I'm not asking about a lot of your time, it's more like I show some of the renders I've got so far, you will then see the issues I've got and maybe you know how to fix them or some workarounds.