I don't know where you live, but I saw Avengers ads (both print and
tv) all over the place for weeks leading up to the release.
While marketing plays a role, AVENGERS was also a very good movie. DS
didn't look very good, not have I heard much positive about it. It
looked the same damn movie Tim Burton has been made several times
already (Edward Scissorhands, Willy Wonka, Alice In Wonderland. etc).
Lots of weird, garish costumes and scenery and Johnny Depp in some
sort of whiteface. People are probably getting tired of it. I know
I am. I liked this movie when it was called ED WOOD but haven't given
a damn since.