I suspect that MtG's big advantage here is having a ton more cards. Hearthstone's meta is pretty straightforward because there are only a handful of cards to work with right now, but the upcoming Naxxramus mini-expansion should make things more interesting, and I'm looking forward to seeing what'll happen when they finally produce a full expansion.
How do you define straightforward? Magic has a lot of cards, but formats restrict* the pool of cards that can be used, and within each format's legal cards, the majority of them are unplayable.
*(in the colloquial sense of the word restrict, except in vintage (and trivially in commander/EDH/Australian Highlander/Chromandercore), where cards are restricted in the magic sense of the words restrict)
From what I understand though is magic still ton of cards compared to HS, HS has ~ 320, isn't that much smaller than Magic, even with restrictions? I think the meta will be a lot more interesting once they expand the pool, HS is still a very young game.
