No building, except for deploying zip lines, drop pods, portals and stuff depending on your class. If it was full priced, but free to play with extra content/season stuff being added continually will keep pop high, for sure. They have already talked about extra classes coming, etc. Most COD4 streamers are praising it, it's like blackout mobility and gunplay with more verticality and tighter action map, with overwatch style classes to learn and master. Polished too, for day 1 announcement and launch. PUBG looks like slow, boring and unoptimised in comparison.