Hmmm, I suppose so, though Lex Luthor and Magneto might rival them. I still don't think people care about Loki though, movie or no movie.
I'd agree with this. I know that in the recent "Favorite Marvel Villains" poll Magneto only lost by two percent. Outside the comic community, though, I agree with @rulerofthisuniverse's point. They may not care about him that much, but he's still very popular/well-know.