Didn't have a problem with the marauder. Just a different challenge. Only shows up like 6 times after the initial boss battle. The activation range for his parry-able attack is a bit finicky, but otherwise you can deal with everything else. Dog doesn't spawn unless you shoot his shield, and it can be killed in one SSG blast.
For all the people saying, "It's not a difficulty thing, it's tedious," that sure sounds like a difficulty thing. He is easily dispatched in 20 seconds or less if you use the SSG and ballista, and I don't even know what the "optimal" combo is or how to do it. Given you fight him about 6 times, maybe a bit more, that's like maybe a a couple minutes of fighting the marauder in a 15 hour game. How is that tedium? How is that overused?
Second argument of "I have to kill everything before him." Well, yes, that's the ideal way to kill him. It's generally inadvisable to fight him while being attacked on multiple fronts. Why is that bad?
Sounds like people want to play Eternal like 2016, where the last half of the game became a mindless repetition of the same circling the arena and using the same weapons and tactics on every enemy. Eternal mixes things up, and not even that often, and for me, it's enough to keep it fresh.
If you ask me, the Archvile is the most poorly designed enemy in the game and the least fun to fight. Fortunately (and unfortunately) he can be killed with the sword, so it almost feels like the Archvile is barely anything more than buff totem with annoying AOE attacks. The Archvile deserved better.