It definitely gets more mechanically heavy in the late game, in a way that kinda diminishes the pure combatness of the whole thing. At first it feels sorta like "you've given me a small set of murder tools, and I need to use them to build a glorious rampage", and towards the end you have so many options that it feels less artful. I still had fun but I definitely understand the thrust of the criticism - especially given how perfectly DOOM 2016 lets you compose a symphony of destruction with just the guns you have.