I do like magical animals, quite fond of them. I have a few characters that are magical themselves, at least four. I like to have a variety of abilities or I'll select a popular one, like fire-breathing. Then, I'll modify it to a certain degree that seems balanced and legit. I think a few reasons people would not like magical animals is for power-playing and god-modding behavior from others. With this, it gives even the simply word as "magic" to read, "power-play" for some. Other than that, it is fun to play animals with magical properties, just play them to where you and everyone are having fun with your character.