BR has been around for over 5 years. It may be 'new' to some users but in terms of the wider market, it's a very saturated genre and Blackout is coming in almost at last-knockings.
I wasn't expecting much as this game mode has only been in development since this year (cough cough cash grab cough) but even so, I would've expected a bit more in terms of personality, functionality and features considering the budget on these games and the omission of a campaign.
PUBG is supposed to replicate more realistic elements - more ARMA than COD/Halo. The mechanics work very well with a keyboard and mouse as they were originally optimised for. COD is arcade, heavily aim-assisted and bullet physics along with recoil is absolutely minimal. Many users who enjoy the challenge that the likes of PUBG brings may not find Blackout very satisfying with more simplified aspects in place.