Infamous is 20 and is exclusive, so the correct topic title would be "Exclusives in the Top 19 for 2014 are ALL from Nintendo". Titanfall is not an exclusive.
I think what this shows though is not that the other consoles lack good exclusives (they do, but I don't think sales figures prove that) but rather that the games that sell at the moment are multiplats, and given that multiplats are almost always a step-down in quality from exclusives with few exceptions, that's a shame.