It's a high end peripheral just like a steering wheel is. It let's you experience game in a total different way and expands the experience. Iny eyes it isn't a gimmick like motion controls which have very little effect on the game play.
Gyro-aiming has done wonders for aiming in shooter games. Don't dismiss motion controls so readily.
Now that said, the reason I know Wiimote is no gimmick is because I WANT to grab that Wiimote controller on everytime I sit down to game now. It has made a 3 years old game I had gotten completely bored to death of (Resident Evil 4) a new and addictive nature making the game better than it was at vanilla release or any other time I've played the game. Again the same deal with Metroid Prime Trilogy, giving the game a totally new level of addiction. Somehow playing on the pleasure centers of the brain in a massive way.
I'm not saying that VR is a gimmick, but if your argument is that it's not a gimmick because you like it, that can basically be applied to anything. And yeah, I genuinely do prefer Wiimotes for quite a few genres.
Yes! RE4 on Wii demonstrated how to do motion controls right!
I absolutely LOVE RE4 on Wii and it demonstrated that a pointer function has its uses. It makes perfect sense: a game with aiming in it stands to benefit from a peripheral that can aim.
An argument could be made that in it's current incarnation it's a gimmick, but as a concept VR is obviously not a gimmick.