I don't think anyone who can make enough of a difference has ever really been in his corner. Johns and DiDio acted like they were, but I tend to believe what was mentioned earlier in the discussion. Because a standard had been set, they felt they needed diversity (a black person) on the Justice League, but they didn't want John Stewart, so they chose Cyborg. For the record, I don't think that is anything to be ashamed of or anything that warrants defending, so there is no need for anyone to be defensive about that. They have their character preferences just like the rest of us, and that's fair. Also, for the record, I can believe that Cyborg's appearance in an iteration of Super Friends did influence the decision, but to a much lesser degree than simply not wanting to use John. Or, if you want to look at it another way, wanting to use Hal as Green Lantern.
I think where Johns and DiDio went wrong is that the people doing the Justice League animated show
actually cared about quality representation, while that seemed to be a
much lower priority for Johns and DiDio. Had they actually been good at that sort of thing, it's within the realm of possibility that they could have won people over with Cyborg the way the animated show won people over with John Stewart despite the backlash he endured from many comics fans. Rather, Cyborg came across as a depressing, out of place afterthought who was present simply to check a box off. You're not going to win over a lot of people with that type of showing.
Regarding the shipping, I also thought that Raven was already paired up with Beast Boy, so no matter how you cut that situation, you can potentially run into clashes with other fans. Once again, leaving Cyborg the strange odd man out
Again, the best way to overcome that sort of thing is to bulldoze through it and be bold. Hence why I would pair him up with Starfire. Some fans wouldn't like that, but to be fair, Starfire is her own character separate from Dick Grayson. She doesn't exist solely to be his love interest,
especially since Dick galivants around with another woman. If the execution is spot and the stories are good the pairing would garner its own fanbase.
I can understand not wanting to create situations that pit fans against each other, but I think it would really help Cyborg (and Starfire) and give them an interesting thing to do that would get people's attention.