FO4 is pretty much just as shallow as 3, but I felt personally it did a much better job of hiding it, because there was nothing as egregiously stupid like, oh, say, the Main Quest in 3. Like yeah the MQ in 4 wasn't great but it wasn't warmed-over garbage either.

But I mean we're comparing both to NV which was one of the best RPGs of any style in years, warts and all, so it's kind of moot.