Yeah it seems like there are mixed reactions on the final evo starters, not only here but also by posts I saw on Tumblr. I think I even saw one that claimed they were the worst-looking final starter evos ever, and then again I thought they all knew 5th Gen had the worst-looking ones (I actually liked them lol, even Emboar) but I like how unique this bunch looks.
Chesnaught was the most unexpected of the bunch, some thought Delphox looked unusual, and Greninja was one I didn't like at first but at least it's not terrible and it grew on me. It's mainly the tongue scarf that I think looks weird, but at least it didn't draw me away from Team Froakie.