I remember reading on the manual of Doom 3 that the game's architecture was comparable to that of an operating system, now comes The New Order and it's basically twice the size of Windows 7 itself.
id Tech 4 was a marvellous engine, still one of the most efficient ones I've ever seen and in goods hands, it still can look incredibly nice (Prey and Dark Mod), but id Tech 5... I just don't like it's incredibly high dependance on streaming huge textures all the time, not only does it bring massive pop-in issues (can be fixed, but only if you use a fast disk, preferable an SSD), but the graphics don't look that good in the first place, also massive installation sizes.
Sure, it runs as smooth as butter (on consoles, on PC, AMD users are banging their heads on their desks with bad perfomance issues), but the payoff isn't that great to justify it's massive installation size.