And I personally think a 45 minute gameplay demo sounds amazing. It makes it that much harder to cherrypick the one bit of the game they've got working and actually indicates that most of the game might be of that quality.
Given that it will be the devs who will play it, it's up to them to decide how to play the game. From example they can choose the way to go from point A to point B, but why do they do it whis way? They may say that they go on foot to show the environment, but it could also be that the horse or boat ones simply aren't done yet. Or why they kill using the sword and only 1 kind of magic, (maybe because the others don't work yet?), etc.
Simply put, with an eyes-on demo developers only show what they want and how they want, which may or may not represent how the final game will behave.
That said, CDProject so far has always delivered, albeit not always when the game launched, so I have confidence in them.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.