Played a match the other day and was impressed. They're far ahead of PUBG in a lot of areas, optimization being a huge one. Parachuting isn't a complete laggy disaster. Actually, just generally a lot of things that are broken in PUBG work right out of the box in Fortnite.
But I don't know if the gun system for the base game transferred over all that well to Battle Royale. In PUBG, most players know the guns, and they know the ammo types, etc... Inventory management is a large part of surviving. In Fortnite, there doesn't appear to be any inventory management, and instead you appear to just pick up weapons and ammo.
Hoping they make the gunplay better.
I'm actually genuinely curious about how else they could have pushed this out the door so quickly. The game went from what? 4-player co-op, to 100-player PvP just like that? Essentially, everything needed for a Battle Royale game is already here, and then some?
Dunno how representative that Steam population is in terms of active users. Consoles generally have significantly higher player counts in games than PC.