He had input on GL, but the studio over ruled just about everything, the movie bombed, and then he Left DC. (there were other things involved too, like the cancellation of his cartoon)
Everything else is fairly recent, so things may have changed in the last 2 or so years for
DC WB where they decided to use their resources more effectively (let the comic writers help shape the movie scripts, because no one knows the characters better).
There was a story a while back about how WB wouldn't let the comic people near the movie people, and part of that was that the comic people don't know how to write movies, and don't know what it takes to make a movie and they are better served writing their comics like they are used too... [paraphrased]
Seriously, WB needs to spin DC off into it's own subsidiary (Comics/TV/Movies) that handles all their own **** partially independent of the WB studio. Do them like Marvel and play the role of the investor. Give them a "loan" in the form of a budget and have them work a plan. If they can make that plan work within a several movie limit, in a specific time frame and become self sufficient enough to pay the "loan" back and continue operating, then they can carry on and do their own thing.
Not that I want 2-3 DC movies a year ontop of 3-5 Marvel movies a year (as I'm not a DC fan outside of their animated work), but I do think they are being handicapped by a Parent Studio that doesn't see their worth outside of Batman and Superman. They could use a little more freedom to stretch their wings and see where they land, knowing full well that if it doesn't work out, they will just land right back in the lap of WB, rolled right back into the corporate structure of Batman & Superman (but mostly Batman) sequels.
To say marvel hasn't done that would be just wrong. Especially when James Gunn just told marvels latest attempt at cross media to duck off saying the current guardian run sucks.
Marvel has obviously included the comic people as much as possible even giving some of them cameos in the latest movies.
And that Gunn comment could be taken either way.
He may have been saying "the Bendis GotG run sucks, don't read it! Don't read anything... but if you must, read the Abnett & Lanning run, it's much better"
or he could have been saying "Bendis GotG run has nothing to do with my influence for this movie, don't read it. I'd prefer you didn't read anything, but if you must, go read the Abnett & Lanning run if you want a better idea of what I was going for.
It was a 2nd hand comment, so it all depends on how you want to read into it.