IMHO both movies (JLA and Supes vs. Batman) are--well trash. There are so many things they could have done better it's ridiculous.
For example in JLA, the team discusses the dangers of bringing back Superman, knowing there is a chance he may be mentally deranged.
They bring him back yet didn't prep for it actually happening???? Batman doesn't bring kryptonite with him from the last movie? What the hell???
I could pick this movie apart so badly it's absurd. And like others have stated, they've powered Supes up so much then why even have a team going forward? No one else is needed. So stupid and a total waste of what could have been.
Superman is always though shown as being their most powerful member,and each on of the Team brings their own strenghts...
And when Darkseid shows up, they will be really glad Kal was brought back!