That was my main gripe. The neat and tidy ending similar to "The Phantom Menace"
It's like they couldn't come up with a good solution to end the battle/movie
"Oh they all just shut down and then proceed to cuff Loki. The End"
Having left over Chitauri running around the earth would have been intriguing.
It would have made for a nice excuse in "Iron Man 3" since Tony is supposedly all on his own.
Fury- Captain America and Hawkeye are on assignment searching for Chitauri stragglers
There was also a plot hole with the waitress that recognized Steve Rogers in the middle of the New York battle.
There's going to be 30 minutes of deleted scenes added to the blu ray release