I don't think Hartnett would be a terrible choice. Gotta give the guy a chance, it's not like he's.. i dunno, now that i'm trying to think of a bad actor i can't lol,.. well he's not super crap anyway and deserves a chance. I remember when people were kicking off about Heath Ledger as the joker when it was first announced, and we all know how that ended. I'm not saying he'll be as good as that (obviously) but i still say he deserves the benefit of the doubt and that he could be interesting in this role.
Gotta give the guy a chance, it's not like he's.. i dunno, now that i'm trying to think of a bad actor i can't lol,..
I've never seen this Alex Skarsgard guy act but the pictures I've seen of him with long hair and bit of stubble would make for a good Thor. He looks a lot like Ultimate Thor, really. I don't entirely mind Harnett as Loki. I liked him in Lucky Number Slevin and Sin City which are completely different type of movies but I'm willing to give him a shot.