The base levels are actually a bit tighter designed than base Doom Eternal - The story is a little more nonsense and not conveyed very well, and i do miss having access to the doomslayer's base and progression, but nonetheless The Ancient Gods shows a promising path for Doom Eternal.
Ancient Gods part one is only mostly let down by a poor final boss fight, but i was surprised to see the base game's most annoying enemies used a bit more cleverly this time around.