I watched it in regular 3D, HFR and regular 2D... I honestly did not see any difference from the HFR to the normal frame rate, and 3D doesn't do anything for me.
Thing is, this being a good film, 3D isn't going to make it any better. After all, this isn't Avatar. YMMV, but Avatar sucked without the 3D wow-effect. The Hobbit isn't going to get better or worse with or without 3D.
But everyone's complaining about the HFR, and my brain simply could not process it.