Good lord, doesn't that site have an editor or at least a proofreader?
Basically all this person said is the JLA is too powerful, so the threat they face would be so large and their powers are so great, it would cost too much money to film. I would disagree, none of their powers are "budget busters". He assumes that their power levels will be the same as seen in the comics, as well. More than likely they will handle it like the DCAU, where the powers were kept at a more "manageable" level. The threat doesn't have to be any greater than what was seen in Avengers, either. All you need is something to keep the JLA occupied in the same way the invading Chitauri did in The Avengers.