Thorn is earned and should be treated as such. Like any weapon, Thorn has downfalls; you just have to learn to successfully exploit them. Just think on that for a while. Play around with strategies. ToO is a great place to do so as Thorn is rampant. I use Thorn. I love it, but I don't know if I can even call it my favorite weapon as there's game-changing aspects about so many others as well.