It just sounds very uninspired to me, so it comes off sounding rehashed. But then they'll take it in a completely different direction with no real natural progression, so it sounds forced. Kind of a weird back and forth with different musical styles.
Personally, I think that's exactly the point. Some songs of this trilogy have a similar sound to their old stuff, other belong to the FBHT sound, other ones are in a completely different style... I just can't see uninspired so much variety, it´s like a review of everything they've ever done in their career, plus some new things (but that's just my opinion).
Regarding Nightlife...well, obviously they are not going to make the greatest "rap" song ever, it's not their style, but I find it a pretty interesting experiment, catchy and innovating. I don't think it deserves so much hate, and I have the feeling that it is getting it because it is not the usual GD style, which seems to be what most of this forum want them to stick in (nevertheless this site is called "absolutepunk" for one reason).