It’s been I suppose weeks since I actually saw The Avengers, which is as personally frustrating as it is lame. But the larger problem (even though I’ve seen it twice) is that it makes it hard to remember any specific discussion I may have wanted to engage. So, obviously it was good. You already know that because I saw it twice. (Savvy viewers may also have known it because of what a good job has been done with the various properties leading up to this moment, or because they’ve watched Joss Whedon’s writing/direction in other formats.)
But let’s say you’ve done none of those things, and now you’re wondering if you want to go see a movie in which the Norse god of mischief acts as a catspaw for an invading alien army bent on conquering the earth and also stealing a head-sized white cube filled with limitless cosmic power, and then a bunch of Marvel superheroes attempt to quip aside their differences and prevent this clearly bad outcome? The answer is yes, and here’s the reason why: even though it may not be the best plot you’ve ever seen, it is very probably the most comic-booky plot you’ve ever seen, and not only is the dialogue consistently great, but practically every moment (and 100% of the moments in the third act) were among the most fun I’ve had at the movies.
Put another way: would definitely watch a third time.