Can a Justice League movie really work?

This week Warner Brothers confirmed that a Justice League movie script was being produced. The rumor has been around for a while and has even increased after the Summer blockbuster Marvels: The Avengers which was directed by Joss Whedon. After this it was a possibility that another big team would be produced, in this case The Justice League. But how will Warner Brothers handle this?

First of all they have to look at the characters. There have been many versions of Batman and Superman. Whether they pick to use the same actors from previous movies (I highly doubt that Christian Bale will once again put on the cowl and the pointy ears) or if they do a darker or more brighter versions of them, we all recognize the red and yellow "S" and the big pointy ears. Like I said, there have been many versions of the two.
However, unless you are a die hard comic fan like myself the other characters are not really known. You might recognize the Green Lantern from the 2011 movie which was rather disappointing and (dare I say) lame but that's all they will think of him as... lame.
The same with the rest of the team; you might know that Flash was the fastest person alive and that Wonder Woman is basically a Goddess, but they don't really know these characters. You would have thought Warner Brothers would have taken a page out of Marvels book by having the characters have their own movies to lead up to the team-up, but rumor has it that the characters will have their own spin-off movies after the Justice League hits the theaters which is rather a good idea to introduce the characters, but for you to get the real feeling of the character during the Justice League movie they should have introduced the characters before the movie (like Marvel did), so that the people who know less about the team and the characters are ready to go and see the Justice League knowing about their attitude, their powers and maybe even how they became how they are. For example: In Iron man we understand that he is a fun eccentric billionaire, who would have died if it weren't for the Arc Reactor in his chest and when he built this Arc Reactor Iron man was then born. It's the same Thor, Captain America and Hulk, we all know how they became how they are. Even Black Widow and Hawkeye have their own little parts in the movies, we may not know them as well as we know the other heroes but we were introduced to them. This is what the Warner Brothers should do (Well in my opinion).