Funnily enough, the Marauder is one of the only things I kind of liked about Eternal.
And the grapple hook on the super shotgun was fantastic, especially in that boss fight where you grapple and then punch the boss.
Other than that, I find 2016 so much better. Some of the things in Eternal were just not fun at all, like the enemies that are invulnerable except for 3 seconds while charging their super attack AND EVEN THEN ONLY THE HEAD TAKES DAMAGE. Felt just unfair rather than difficult.