Hint: The "this" that I am tired of is not "superhero movies" or "sequels".
Answer: It's the whole 'white women clinging to white men like that's the be-all end-all of creative movie postering and not the same old shit we've seen in nearly every other movie poster since time began' thing that I am tired of.
Especially angry-making because I recently re-watched The Avengers after re-reading Chris' excellent post on (and this is my words here, not necessarily his) Joss Whedon cutting 'secondary characters' out of the movie as though that act is somehow gender-neutral (it's not) and as though 'primary characters' in superhero movies aren't overwhelmingly cis male (they are) and as though 'secondary characters' in superhero movies aren't overwhelmingly the only major* female presence in the movie (they are) and as though it's not sexism that causes this (it is) but rather somehow bad luck, like we assign superhero gender expression by rolling D&D die (we don't).
* I don't want to quibble over what constitutes "major", but the handful of other women in Thor and Iron Man don't count for me. Take that for what you will, or don't.