Well, that's what happens when you only get one side of the story (although I think that he specifically complained about people at DC. I can't remember what he said about the Avengers story).

2004 interview:

TH: There was some talk in 2002 that you were going to return to Marvel to write an Avengers series. It was apparently one of Joe Quesada's initial ambitions as EIC at Marvel. How did this come about, what was the concept, and what ever came of it?

JS: Joe asked me to do a sequel to the Korvac saga. Though the money in comics these days isn't very good, he persisted, and finally I agreed. I figured it would be fun, and I'd fit in somehow. I wrote an 8,000 work overview of the eight-issue story. Joe and his editor, Tom Brevoort seemed to like it, but I found Brevoort to be a pain. Didn't get along with him, mostly because he kept insisting on lecturing me about introducing characters not doing "paper cut-out" characters in the action scenes and such…before I'd even started! I asked him if he lectured John Buscema about making sure to draw with proper perspective and correct anatomy, which only got him up onto a higher horse. I surmised that this wasn't going to be fun and I had plenty of other work, so I bailed.

TH: What about the "last Legion story" you were rumoured to do?

JS: I proposed writing one last Legion of Super-Heroes story, a ten or twelve parter that would make nice trade book, to Paul Levitz. Paul agreed to do it. Then we talked a few days later and he told me that there were people at DC who hated me, and were up in arms at the thought of my doing any work there. Paul said it would be "more grief than either of us needed," and that was the end of that.

TH: Will we see more Jim Shooter work at the Big Two any time soon?

JS: I don't think so. I don't think they have any use for me. I’m pretty booked up at the moment, anyway.

TH: Do you think the industry today is the epitome of what you were trying to prevent during your EIC tenure?

JS: Yes.

Your word against his then.

****************

Looks like the interview Rob posted the excerpt from supporsts Glenn's claim.

Your word against his then.

***

Well, What motive would Glenn have not to be accurate?

The parties involved might-Shooter and Brevoort, but Glenn has no reason not toi call it like he sees it.

Anyway, it is clear to me that Shooter's own personality continues to play a problem in him getting work.  But, still, I like his story "the started writing comics at 13" so I wish it would all work out

Since Secret Wars came up:

(and yes I am aware that he is making it seem like a book that probably made him a lot of money just sort of fell into his lap).

TH: Why and how did the Secret Wars books come about? Have you read the current non-related "Secret War" by Brian Bendis?

JS: Kenner had licensed the DC Heroes. Mattel had He-Man, but wanted to hedge in case Super Heroes became the next big fad. They were interested in Marvel's characters, but only if we staged a publishing event that would get a lot of attention, and they could build a theme around. Fans, especially young fans often suggested to me "one big story with all the heroes and all the villains in it", so I proposed that. It flew.

Mattel thought that kids responded so well to the word, "secret" so after a couple of working names bit the dust, we called the story Marvel Super Heroes Secret Wars. I didn't need the hassle of writing it, but if I'd given it to any of the regulars, say Claremont, Byrne, or Michelinie, there would have been a lot of carping and complaining by the others. Pretty much every writer had a jealous, protective, almost proprietary feeling about "his" or "her" characters -- a good thing, in a way -- and I figured that the surest way to start a brawl in the bullpen was to give one writer a years' worth of opportunities just to piss off the rest. So, I wrote it.

I figured that they were all usually mad at me anyway…and I was the boss, the man designated by Marvel to be responsible for the characters -- so nobody could really argue with what I did. Let me rephrase that -- they could argue, and I'd listen, and sometimes agree with their points and make adjustments, but it was my call in the end. Besides, I was too big for any of them to take a swing at me. Secret Wars sold something like a million copies of month. To this day, people bring me issues to sign and tell me it was what started them reading comics.

I don't know about any new iterations.