The leaked videos (and no, Im not supporting piracy or advocating it, i'm just as curious as the next guy or girl) pretty much showed the areas we have been seeing in the official videos. The combat, to me, seems, horrendous, the dialogue options even worse, and the voice actor for Moira is terrible.
I agree that the previous games had grasped the idea of the vast opnenness much better since you there could go for days or so it seemed without meeting anyone. Here it just seems like everything is crammed together so that there is action, action and utter action all the time. And by action I mean you shoot people or monsters a lot...
The only thing that's looking good, to me, are the buildings and the world destruction...