Well classic Doom has more complex level design while nu-D44m has corridor arena corridor from what I was hearing. From the gameplay I seen it was just copying Brutal Doom which from what I played was worse than vanilla Doom and just makes it more modern which is shit. Also different weapons had different purposes for different enemies like using the chaingun on the mancubus to stun him and keep him from attacking which is quite dangerous for example. That snapmap tool also looks really limiting. Complex level design would be too hard for the kiddies.