Well to be blunt, you can't really 1:1 recreate classic Doom in 3D due to the way the gameplay worked and was designed to be played on a flat, two-dimensional plane.
This game is more Quake 1 without rocket jumping
than classic Doom, and thus far I'm totally okay with that.
Really my only gripe with the gameplay is the RPG stuff they shoehorned into it.
Stuff like siege mode on the rail gun being pretty worthless in heavy firefights unless you use it a lot and get the upgrade that allows full movement. Like why would I use this dangerous function that has little real time benefit vs free movement just so I can use it later and actually have full range of motion? Why not just give it to me to start out with? Oh yeah, shooters in 2016 have to have some kind of dumb RPG system to keep people engaged in a 10 hour campaign T_T
TNO had the same problem, but it's not near as stupid here as it was in that game. TNO's completely arbitrary upgrade system really soured me on that game. "Hey if you want fast movement you have to throw a bunch of knifes at people in stupidly specific ways!" Uh, what?!