Masterful use of scoring music to what's onscreen. This teaser resembled less a cookie-cutter comic book trailer rather than a Terrence Malick film. Most importantly, there is none of the slow-motion expected of a Zack Snyder film.
It looks like Nathan Fillion might be playing a superhero afterall. After being considered for roles in Green Lantern, and Captain America,Fillion (most remembered as Malcolm Reynolds in the cult-hit Firefly) is reportedly in final negotiations to play Dr. Hank Pym in the new Avengers film. It hasn't been stated whether Pym would be Ant-man in the film, or just a S.H.I.E.L.D. scientist, but we're holding out hope.