The game felt kinda empty though. That's my only concern. Right now I'm really enjoying Rainbow Six: Siege, so not sure how this will play out. I probably will end up getting it. I remember seeing this for the first time, it was the only game that grabbed my attention.
In terms of map size, it's roughly the equivalent of GTA5 downtown area. Only difference is that there are no cars, so you have to run everywhere. Also, The Division provides depth with the subway system.
In the closed beta, there were a lot more rogue agents fighting one another. The open beta was more civilized though.
Map-size comparison: