I feel you on that. I feel as though it has to do with a lack of stars and leaders in the class. Its a very talented class this year and its not short on hits, but no one has that star aura like previous classes. I think the audience is wiser to fads than they even know themselves so even though people riding Fetty Wap hard, they know years from now his sound is going to be largely irrelevant to them. He's probably the biggest name on the list too.
Here's how I tiered the individual classes:
2008 Leaders (Lupe Fiasco, Plies, Lil Boosie,) Young Dro. Fads (Rich Boy, Gorilla Zoe,) UG (Saigon, Joell Ortiz, Crooked I, Papoose.)
2009 Leaders (Kid Cudi B.o.B, Wale,) Stars (Ace Hood, Curren$y, Asher Roth, Cory Gunz,) UG Blu, Mickey Factz, Charles Hamilton
2010 Leaders (Wiz Khalifa, Big Sean, J. Cole,) Stars (Nipsey Hussle, Jay Rock) Fad OJ da Juiceman UG (Freddie Gibbs, Pill,) Fashawn, and Donnis.
2011 Leaders (Kendrick Lamar,Mac Miller, Meek Mill,) Stars (Lil B, Big K.R.I.T.,Yelawolf, YG Diggy Simmons,Fred the Godson) Cyhi The Prynce, Lil Twist,
2012 Leaders (Macklemore, Future) Stars (Iggy Azalea, Machine Gun Kelly, French Montana, Kid Ink,) Danny Brown, Hopsin, Fad Roscoe Dash Don Trip
2013 Leader Logic,Joey Bada$$? Stars (Kirko Bangz, Action Bronson, Schoolboy Q, Ab-Soul, Travi$ Scott, Dizzy Wright) Fads(Trinidad James,Chief Keef) Angel Haze
2014 Leader Chance The Rapper, Stars (Rich Homie Quan, Ty Dolla $ign, August Alsina. Lil Durk,Kevin Gates, Vic Mensa, Lil Bibby,Troy Ave, Isaiah Rashad) Jon Connor, Jarren Benton
2015 Stars? (Raury,Vince Staples,Tink, OG Maco) Fads (Fetty Wap, Dej Loaf, Shy Glizzy, K Camp) Kidd Kidd,Goldlink
So I feel as though previous years have had people there that clearly had hype on them before they were on the list and everyone was paying attention to while this year has a lot more niche artists that satisfy a specific crowd, but lack crossover appeal. My guess for no one caring this year is lack of common interest.