We may have different definitions of gimmick xD I tend to use it as a more negative term. If it's an integral feature that's being talked up and doesn't deliver, like a Wiimote, I tend to refer to it as a gimmick. Where as something like the face mocap in L.A. Noir isn't a gimmick to me because it actually does what it's supposed to and deserves to be front and center as it is.
Nemesis could be either of these.
