That's only because details are still scarce on TA2. The only things Joss have confirmed about the movie is that Wanda & Pietro are in it, that it's more personal than Avengers 1, and that he's "twisting the knife" on them, whatever that means. At this point, we're still in speculation wars about Thanos, Masters of Evil, Ultron, about how many Avengers will be on the roster, about who (if anybody) "dies" in this one, etc.
GOTG, otoh, has been delivering a ton of very interesting casting news with some very big names involved, so the hype is going into interstellar overdrive.