Having just seen the movie, it has only added to my view that Cameron is talking complete bollocks on this one.
The film was excellent.
There’s also a rather nifty epilogue sequence on the DVD/Br ‘Etta’s Mission’, where they go after what look like a mother box. No way that doesn’t play into Justice League.
Where Marvel are going for the notion that their heroes are just like us, except with powers or tech, DC are going far, far away from that. There is a gulf between Diana and the others in what they can do and she can do. She can single-handedly change what is possible for them in a way that would never be available to them. The No Man’s Land sequence demonstrates this.
Similarly, when DC decide to show superpowers, they don’t hold back and the final fight with Ares shows that off very strongly. I particularly liked how it concluded and the visual aftermath - that where Ares was, there is this massive, red-hot, smoking crater. This is arguably the first film of theirs to really nail the ‘gods among us’ angle they’ve gone for.