My number one takeaway from spending a bunch of hours with "Firestorm" was that, in 2019, "Battlefield" is still a really good franchise.
It's probably not a shocking revelation to the millions of "Battlefield" fans around the world, but I promise it has implications here: Though "Battlefield" remains excellent, the Firestorm mode only serves to highlight that the best version of the game is the already existing, non-Battle Royale modes.
Firestorm is essentially a more limited version of the massive, tactical modes that "Battlefield 5" already offers in Conquest and Rush. The major additions that Firestorm brings to "Battlefield" are limitations: You only have one life, and the game's usual class system is nothing more than a cosmetic choice.
Is it fun? Yes, it's super fun. But, arguably, "Battlefield 5" multiplayer was already very fun, and arguably more fun than this new mode.
That said, if you're a "Battlefield" fan who's been waiting for a Battle Royale aimed at you, Firestorm is absolutely that.