Not bad for something claimed by many to be unplayable.
World rife with detail; dense vegetation, animals, squeaky gates and interesting architecture. Various visual (motion blur, camera bob while moving, etc) and excellent sound effects really tie it all together to form a nice atmosphere.
The campaign indeed looks very promising, a far cry from the 'old' Arma, with a few cut-scenes here and there to easy you into the action and 'dynamic' mission flow. Don't be surprised when a perfectly good plan needs to be revised due to unexpected circumstances.
Any bugs encountered were minor, and considering the first patch is already up I'm sure this will shape up to be a worthy succesor.
Now if only I can get my PC to play nice; as usual when trying anything new I had to fight it all the way.