I agree, I just bought it myself!
What finalized my decision is that you can turn off all the blood and gore (the original version looked fun but a bit nausiating ) and that it fills in empty matches with AI teammates!
This last point fixes the seemingly low population, as I honestly can see much difference between the AI and the other players! I think the AI may actually be a tougher opponent sometimes
Kind of want to get Playstation All-Stars: Battle Royale, but even $9.99 seems like too much for that game. I'm quite certain the price will go down pernamently to $19.99 very soon or it will become free on PS+ within the coming months anyway. Other than that game nothing else catches my interest at all.