I don't know if I would have named it "fairy" type, but I don't really mind.
I'm bearing in mind that I'm older than when I first played Pokemon, and it is aimed at young children too, so "fairy" is an ideal name for the type.
It might seem like it's not a very mature name, but the game isn't especially mature to begin with.
And, the name very easily describes a large number of Pokemon already introduced, who have sadly been stuck with the "normal" type, despite really being something more than that.
And who doesn't want to learn new move-types and have new interesting battles that you've never had before?
There's sure to be some great moves that will change the tides in all sorts of battles.
I'm quite curious to know if Fairy will be predominantly offensive, or defensive.
I get the feeling that a lot of fairy pokemon will be great partners to have in double/triple battles.
