Ok, you're right, I shouldn't say they suck. I should instead say that they are overrated. Even if you prefer Adele over Katy, there is absolutely no way that you can say Adele deserved 6 Grammy's that night and Katy deserved 0.
Music is, was and always will be subjective. If you don't like Adele or Miley that's totally fine, but you can't really say they're overrated as if it's a solid fact. Most modern singers (like Adele, Miley etc) have unusual qualities to their voices that may sound beautiful to one listener but irritating to another, it's the same with most artists, even Katy.
I think Adele uses her voice wonderfully and you don't, and that's totally cool. But a LOT of other people love Adele's voice and where awards etc are concerned, majority rules.
But anyway, back to the topic of the thread... I was just checking out Irish iTunes to see how Katy is doing there. Roar is at no 12, Unconditionally is no 36, and Dark Horse is at 171... Dark Horse hasn't been as popular here but I'm sure when the promo starts it'll shoot right up.