I played all of the content in the beta over the weekend, and I found it to be good but not great. The new areas look great, with a lot of nice little details to make the world feel real. When the audio worked (which wasn't often) the guns and music sounded great. I liked the "brand" sets for the green/blue gear. It adds a nice layer of customization for early game. And the new types of encounters, like hostage situations and public executions were fun too. There was a lot to like there if you were a fan of the first game, which I was. However, there were a bunch of things I didn't like.
I like the idea of control points: fighting off a few waves of enemies, calling in civilian support, claiming it for bonuses in that area, and paying resources to "stock up" the supplies at the control point. But I already hate that the supplies constantly drain after doing so. I can tell that it will be annoying trying to keep all of the control points owned/stocked as you unlock more of them. I really hope there is a way to permanently claim them. Not only would that make it feel like you're actually reclaiming the city (ast he main plot implies) but it would also be one less annoying thing to worry about in end-game.
I don't like that, yet again, our player character has no voice. That's basically unacceptable today, given the fact that there are so many other voiced characters in this game. I also don't like the new running/falling animations. They look awkward. They were much better in the first game.
I don't like that there are only three end-game specializations. That's not enough, and none of them are powerful enough. I played the end-game mission and niether the grenade launch nor 50 cal sniper one-shot anything; especially if they had armor or were elites. To make matters worse, you can only have 6 bullets for those special weapons, supply crates don't give you more, and enemies barely dropped ammo for them. Though that last one is probably a bug. My brother said he had multiple drops for his, but I never saw any despite us being in the same group and killing the same thigns. They either need to make those weapons do significantly more damage, or they need to give you more way more ammo.
Overall, I played a ton of the first game and I liked what I played in the demo. But like the first game, I expect a lot of issues at launch, so I will probably wait for a price drop or a few significant patches before diving in.