Thor would have his hands full with either Jenny or the Doctor, leaving Iron Man and the Hulk to take on Apollo, Jenny/Doctor, and the Engineer. Swift, Jack and Mightnighter would beat Steve, Hawkeye, and Black Widow.
The Authority take this, the avengers have too much dead weight in the street levelers. This plus the two reality/high end matter manipulators net the win for the Authority of which the only ones I see being able to take on is Thor and thats debatable. Thor, Hulk, and Ironman simply can't carry the team.
__________________ The end always justify's the means by which they were brought to.