At first, I was (poor hardware, poor use of 3D, not that many games), but now, well, it's my most played system...
I remember how impress I was by the Vita when I first got it+some awesome games, but as much as I love the system and I vastly prefer it over the 3DS (specs and hardware wise) most of my 2013 favorite games are on the 3DS and they keep coming...