I was anxiously awaiting Uncharted 3 in 2011 and picked up 3D Land for the 3DS around the same time. I was excited for Mario too, but I didn't expect it to keep me from playing Uncharted 3 for weeks (extensively anyway). I remember one night booting up my PS3 with the intention of playing Uncharted as I was "finishing up" my play session with 3D Land. Hours past as Uncharted remained on the title screen with me feverishly playing level after level of Mario.
I did like 3D World quite a bit more, but 3D Land is a gem as well.
That's funny! Yeah, when I think about what makes comes really great, originality comes into play, and 3D Land was a breath of fresh air. We know what was coming with 3D world, and it was great, but it wasn't as unique as 3d land.