Even supes mom thinks justice league will suck

In the interest of fairness, she didn't say it would suck. She said it wouldn't be as good as The Avengers. Age of Ultron wasn't as good as The Avengers, so I'm not sure what this proves in terms of the lame 'fan war' being waged on the internet.

And it's her opinion. I'll tell you JL doesn't look half as good as either of the Avengers movies from the trailer alone, but again that would be my opinion. Hardly proof of one film's superiority over another, particularly when it hasn't even been released yet.