Because most of the time who's in the lead takes decision, takes decision on which way things must be made and this means in every way possible: be artistical, be gameplay and so on. And since those are FOW are just good with making movies (and they're not even remotely good and there are others, far more better than them - who works even as a "soloist" - who yes, makes short videos of 5 minutes or 10 but the quality there is much, much more enjoyable than theirs) I clearly see this as a failure. Even I can, with appropriate knowledge of course, can make a trailer that looks so gorgeous, so beautiful, so entertaining. And always talking about others developers even AAA, you know what I'm talking about. Lots of trailer games were made incredibly but the.. execution of that said in the end was downsampled and so on, with the game being much more less enjoyable (graphically and sometimes even gameplay speaking) than the original version shared with the world.
So again, you can make wonderful trailer, you can make wonderful arts but if the one who's in charge doesn't really know much about how things works (and again, they have just made movies until now. That's why I don't expect a mindblowing porn game from them the first time they try to do this. And this is why I'll say that it will be most likely.. let's be optimistic here and change, 90% of failure and 10% of success), he can simply screw up things. Artist and such, again, knows what they're doing but it's the "how" that is much more important.
Also, the "sketch" that someone on /aco/ shared about that.. tentacle girl? Squid girl? Don't remember, wasn't really that great. And again, what most of them pointed out, the chars showed so far, lacks completely of interest and watching at them closely and repeatedly, honestly, doesn't really arouses me that much. Any of them. Maaaybe just the one with the horns a little, but that's it.