I can understand how people can find this dull like most people found Vertigo. It's certainly flawed like that album is. No Future sets itself apart from its predecessor by being a lot less bleak. It's got a lot of the sadness, sure, but the instrumental pallet is brighter and has a bit more synth. I listen to it when I'm moody and need something pretty sounding to soothe me. I listen to Vertigo to feel devastated.
You need a lot of patience to get into this album. Some of the songs should've been cut as they don't offer enough of a unique spark. The highlights are certainly worth it. As a super fan, I'm very happy with No Future. Good Morning, Hertz, Rushing, Just Saying, Fomo, and Untitled gave me exactly what I was craving.