Stan Lee only created The Avengers because it was the easiest way to get a comic book out in time. The art on Daredevil #1 was late and Marvel would have lost the printing fee they paid in advance if they didn’t print SOMETHING, so they needed a new comic. Instead of creating something new, Stand Lee took a bunch of existing heroes and just had them team up.
The jukebox's blowin' a fuse
My heart beatin' rhythm
And my soul keep-a singing the blues
Roll over Beethoven
And tell Tchaikovsky the news