I've played about 30 minutes of it so far. It looks/sounds lovely, and some of the dialogue is funny. It's easy to follow, but maybe a bit slow. On the whole, I'm mostly liking it so far. I'll give you my take on it after I'm deeper into it.
I'm very glad you're liking Tales of Zestiria. Good idea waiting for a controller before getting really into it - Doing a hack and slash JRPG with a keyboard does sound pretty awkward, yeah.
Tales of Zestiria is great. I'm holding off on playing too much of it until my controller comes in in a few days (Action RPGs like Tales just don't work well with a keyboard), but it's a really good game.