I actually quite like the idea of humans in Equestria, it's just that execution is beyond terrible most of the time. I don't really see humans fitting with the animation of the show itself, either. I didn't like Equestria Girls. Not because it's humans, but because it's a badly written story with an even shittier setting. Also, I really didn't like the designs.
I don't know, it could fit well, but I think that it would visually not fit too well together, at least for me.
Also, what Hovershy said under me. Completely agree with that.
Even though I like to think that EQG isn't canon.