UGH. What the f**k did they do to those Forerunner interiors!? Half of them look Covenant (seriously, one of my favorite shots from the game, when Chief does the rock kick down the deep, dark, anchient pit, will look like he's kicking it into a Covenant fuel refinery now), and they lose all of the atmosphere that made them great. The lighting is just... godawful. It's like 343 just thought that adding as much grooves to the blanker spaces were good. Um. No. It ruins what we know as Forerunner.
When they start ruining the original vibes, then that's where I become a Nazi.