I've read all the impressions from the PAX East show that I could find, and they were all overwhelmingly mild -- including ours. As you hopefully know by now, Elder Scrolls Online showed off its instanced PvP battlegrounds, and the media consensus is that they are... coming. And that's it. This really surprised me. It's superficially hard to tell whether people have come to expect one thing from battlegrounds (because so many other games already have them) and ESO really isn't changing the formula -- or the battlegrounds really aren't anything to write home about.
If you were to take Lead PvP Designer Brian Wheeler's word for it, battlegrounds will change PvP in ESO forever because they're a type of PvP that ESO has never had before, which is true. Personally, I do believe not only that battlegrounds will bring something special to Elder Scrolls Online but that other games should pay attention to ESO because it's actually doing something innovative without drawing too much attention to it.
Battlegrounds aren't perfect; there will be some drawbacks, but let's take an honest look at what this new PvP type means for Elder Scrolls Online and maybe other MMOs in the future.