My nieces and nephews LOVE Skylanders. In their houses they have dedicated shelves of the damn things. They also have Disney Infinity but have never purchased any extra characters for it because it's "boring." Their words, not mine.
It really must be a U.S. thing then. I've been watching the sales charts for them both, and DI seems to have dominated Skylanders over the holidays in the U.S.
http://www.amazon.com/best-sellers-video-games/zgbs/videogames/ref=pd_dp_ts_vg_1#1
Skylander has almost been bumped off the top 100 list, while DI is number 47.