I don't think the game should only have a single map, from my perspective that would make it quite repetitive.
You haven't played PUBG? At first the game gives the perception that you just loot and move around the map until an enemy sees you and kills you instantly, but then you end up getting used to it and getting better at it. Maybe this map is just the same.
I wish they would release smaller maps as well, a COD Deathmatch style multiplayer wouldn't be such a bad idea. I saw the trailer of this BF and it looks really awesome with all the different additions, so hey, maybe we're rushing to judgment.
They're going to surprise us, I'm sure of it :)
It's only for the beta though. The full game will have a lot more maps for sure. I'm just disappointed the one map they gave us for the test was quite boring.
I've played a ton of PUBG and I'm fine with running around without action in that game because I expect it. It's different in Battlefield though. You go in expecting war and not running across endless fields like that.