This DLC is basically more Doom Eternal, there's nothing much to say in this regard. If you like the fast paced action, the Adrenaline rush and the ammo/health micromanagement of Eternal, you're bound to like the majority of this DLC. It adds up new environment designs to the series as well so it still feels unique in its own way.
I didn't like the new enemies added in this expansion though. Honestly most of them go against the general direction of the game, which is non stop moving and shooting. The spirits suck, because standing in one place using the microwave and hoping you won't die till it's over is a terrible design. Blood Maykr having a shield all the time and you have to patiently wait till it drops it to headshot it is also a lame design, not particularly hard, but just lame when you're supposed to be continuously on your toes and moving not waiting for certain enemy till he drops his shield. The Marauder was honestly better, at least he usually appears on his own and not alongside other enemies, and he's easy to get stunned to death with practice, but this one Maykr was a bit lame in my opinion.
The last boss fight was terrible and has a ridiculous difficulty spike that's honestly more unfair than being fun. I finished the base game on Ultra Violence (which equals hard here) with no problem, but had to go with Hurt Me Plenty (Normal) in this DLC to not rage quit, and still the last phase of the final boss was ridiculously unfair.
But still, if you enjoyed the main game and you want more and new levels, this is worth the money.