"Glory Kills are annoying, take the immersion out of the game, the yellow/blue flashing is stupid, it lock you into a two second cut scene, etc."
SOLUTION: You can turn off the glory kill highlights in the options menu, in-game upgrades can speed up glory kills, or you can simply NOT do them.
"I don't like the weapons, player upgrade system."
SOLUTION: Marty said in the video that you can beat the game using the vanilla weapons and base stats only.
"The game play is too slow for it to be DOOM (This has been a frequent one)."
SOLUTION: There is a power up in the campaign (Haste) which can greatly increase your speed, or you can use the upgrades to increase overall speed and/ or increase speed after a glory kill sequence
"The weapon wheel slows down the game."
SOLUTIONS: If you're playing on console, figure out which weapon is where so you can quickly switch. If you're playing on PC, you don't have to worry about that you're using the number keys to switch weapons.
"The game is not difficult enough, and there aren't enough enemies."
SOLUTIONS: The first level they showed is the second mission, there aren't going to be too many enemies. Notice how in the second and third levels there was more enemy variety and quantity. Marty Stratton said there can be up to 30 enemies on screen at once. And in the hardest difficulty, demons respawn when you backtrack, there are no checkpoints, the AI is overly aggressive, and you restart the ENTIRE game if you die.
"The game isn't scary enough"
SOLUTIONS: Go play Doom 3 or Doom 64.
"This game looks like HALO"
SOLUTIONS: Is that really a BAD thing? Halo took some things from Doom, Doom took some things from Halo. All is fair in love and space marines.
"This game has been consoliezed"
SOLUTIONS: PC will have an abundance of advanced settings and the FPS won't be locked at 60.