Well, for Generation Zero, I felt like the closer I got to the endgame and FNIX Rising the more obvious it got that Avalanche really expected you to do middling discovery and fetch quests to prepare, and it becomes incredibly unbalanced system wise (especially in FNIX Rising, which is tacked on crap that had no playtesting for balance). I saw a similar pattern in Rage 2.
Generation Zero was a really, really, really bad first experience for me.
I actually liked New Vegas’ open world and its a miracle it turned out the way it did, and within the span of a year. Night City too, but CDPR had a long time to get it right and I even waited a year and a half post-release.
All rely heavily on fetch quests as the basis of their game loop, and all of them are flavored fetch quests. I played Generation Zero and got sick of it quick, and it quickly became apparent as I played Rage 2 that this is most of the experience.