4, 6, 8-cores, but where are the killer apps?

We have mobile devices with 2+ cores now, but where are the killer apps? Samsung is pushing 4k video recording on their Note 3 and SGS5, but that's it? The other OEMs have the specs, but for what? Games? Sure, mobile games are getting better, but only a few are pushing the borders. Most are simply simple games, made for the lowest common denominator.

Whenever you look at the promotional materials from Qualcomm, nVidia, etc, we have like monster hardware in our phones that can do magic. Yet they still lag browsing the web. :D

Are we missing something?