I think looks worse than KnK, Zero, and HF. I mean the character designs always look off compared all of to the other adaptations, the effects range from being mediocre to "fire.gif" levels of bad. I'm not saying its bad bad, but it doesn't live up to the hype in the same way that Ufotable's other shows do.
I don't really remember anything wrong with the animation, but Ufotable isn't known for their animation quality anyway.