The enemies need to be faster and more threatening if the combat is gonna happen mostly on flatter and open terrain with lots of space to move. I know the idea is to make the Doom guy slower as well, but just from the bits of footage, the projectiles from enemies looked super slow, and of the enemies that actually moved, they were generally slow, too. Everything seemed incredibly easy to avoid.
And it perhaps looked a little sparse in terms of enemies given the size of the areas in many of the shots. Obviously this could all just be a non-representative slice for footage purposes, and we've seen Doom trailers not show off the game in the best light before, but so far, I'm not impressed from a gameplay standpoint.
I do like the more medieval theme, and it looks pretty good visually. For the soundtrack, I'm also not sure the hyping up metal tracks will work quite as well in a slower-paced game with less arena/wave-based encounters. Maybe just used more sparingly? Otherwise I'd almost like a more subdued, sort of atmospheric kind of soundtrack. And I say this as somebody who loves heavy music. But we'll see. Again, just a trailer.
EDIT: Just watched the interview where they talk about the design decisions a bit more and I can kind of see what they're going for in terms of slow projectiles and all that. Thing is - the original Doom worked with these slower projectiles cuz you usually didn't have a lot of space to move, so you had to have a good amount of environmental and spatial awareness to ensure you were leaving yourself space and all that. I think if you have big open, flat areas, it's a lot harder to make it a challenge for the player. Like, I'm playing a retro shooter Forgive Me Father right now and one of the big aspects of it is how tight spaces are, and that makes things tough. But as soon as it does open up on occasion, it gets way easier unless they add a whole lot more enemies.
I dont mean to sound negative or disappointed here as much as I probably am, cuz I do trust these guys to make something fun and challenging in the end. Hugo Martin gets pretty hardcore into the playtesting side of things, which is great. And the game isn't coming til next year, so lots of time to build and fine tune things. Just wasn't super convinced by the footage they did show. So far.