you're exaggerating, the graphics are good, the video is compressed to hell and back. And the graphics question isn't even here, if you've played the game you know it looks great, and that's a model you can already see ingame.Probably because that video literally just shows a character model with PS3 era graphics walking around a map.
Other than the new map it looks largely unchanged from the closed beta and I suspect people were looking for something more substantive.
I will give it the benefit of the doubt regarding the potato graphics as I suppose PH devs may well be running it on an actual potato.
The walk animation is just really janky but it's not a big deal.