Heck, I know many people may not agree with me, but I think most features are gimmicks including:
1. Video: 3D & 4K. One day it will be 8K.
2. Audio: 7.1/ 9.2 surround sound. One day it will be 11.4.
Even DTS-HD & D TrueHD is a gimmick, but I'm a total sucker for it.
Room Corrections like Audyssey, ARC, & other EQ & DSP modes.