Not gonna post my full 2015 list, but here are the highlights:
Fun Home by Alison Bechdel
There Was a Little Girl by Brooke Shields
Zealot by Reza Aslan
Missoula by Jon Krakauer
Saga by Brian K. Vaughn and Fiona Staples
Y: The Last Man by Brian K. Vaughn et al.
Miss Temptation by Kurt Vonnegut
The Rosie Project by Graeme Simsion
The Divide by Matt Taibi
Beneath The Surface by John Hargrove