Long time lurker who felt compelled to jump in for the cinematography debate, as the son of a cinematographer...
"Scope" in this context isn't referring to the scale of the film, it's referring to the 2.35:1 aspect ratio (it's short for CinemaScope, a format that used that ratio).
I am excited for the film and a huge Whedon fan -- however, I do think there are some poor visual choices in what we've seen so far. That being said, I don't think they have anything to do with aspect ratio, and as many on here have seemed perplexed by the decision to shoot in 1.85:1 versus 2.35:1, I wanted to offer my two cents.
1) The 3-D factor. The post-conversion leads people to think 3-D is somewhat of an afterthought, but I don't think it is. Whedon directed Thor's post-credits sequence, which he shot on 3-D cameras, and reportedly didn't like the experience. Someone also mentioned early on when they were in pre-production that they were running tests on 3-D cameras. They clearly thought about shooting in 3-D, and when Whedon didn't like it, decided to shoot it in 2-D with plans for a post conversion.
I think filmmakers these days are aware that bad 3-D hurts more than it helps, and are gradually learning the methods of shooting that make a 3-D film more successful. Some factors for shooting for 3-D include:
-- Longer takes, as the eye has a harder time adjusting between cuts when it's seeing in three dimensions. Bay talked about learning to do this for TF3. Fright Night and Hugo are full of very long shots instead of fast sequences with lots of quick cuts. So far we haven't seen enough footage to know if they did this in Avengers, but Whedon is a fan of long tracking shots, so I'm betting it's at least partially the case.
-- Brightness -- 3-D has a dimming effect, so dark scenes don't look as good. Witness the awful post-conversions of the very dark Last Airbender and Harry Potter. I think this is why Avengers looks so bright and why so much is set in daylight. TF3 was the same way, as was Hugo, which takes place almost entirely in a brightly lit train station, and I think contains maybe one night exterior in the whole film.
-- And another factor, and yes, I'm getting to my point, is aspect ratio. 3-D looks better in "flat" than "scope," perhaps because the emphasis on height over width creates a more immersive experience than the widescreen look. Cameron talks about it a little in this article:
http://www.firstshowing.net/2009/cam...ze-everywhere/
2) Secondly, scope ratio was traditionally thought of as the ideal ratio for movies with a lot of horizontal action, as the screen is extra wide. It was perfect for big battle scenes, be it Lawrence of Arabia or Lord of the Rings. However, it's less useful for movies more concerned with height that with width. If there is a lot of action that moves top to bottom as opposed to left to right and right to left, the wide frame is somewhat useless, with a lot of extra space to frame out that isn't being taken up. This is why many of the biggest films not shot in scope focus more on vertical action than horizontal: Spider-Man, War of the Worlds, Jurassic Park, etc. As Avengers focuses on an alien invasion, the ratio makes sense for that reason too.