Grey Gargoyle(ok, kinda lame but I always like him) The Destroyer, Ares, Hercules, Enchantress, Ego the Living Planet

and yes, his wicked trickster half brother Loki

If you don't like Thor, then fine. But this is a Marvel Studios joint and they've gave us every reason to believe that they can transfer their own characters to the big screen extremely well

You're clearly a Thor hater though, calling him marginal... he's the God of Thunder and it was Loki that brought the Avengers together in the first place. How could you even think for a second that Stan Lee and Jack Kirby's Mighty Thor would be lacking cool bad guys?