A small sampling on how different those portrayals are.
I'm not going to write an essay on this but a few thoughts on the stories/writers that did the retconned parts.
Loeb: Hush had some of the most ridiculously biased statements against Jason to the point I wonder not just why Bruce took him in but why he mourned him. Jason impressed Bruce with his guts, honesty, bravery and skill before he took him in. Yet Hush acts like Jason was some arrogant kid with no skills which doesn't just reflect badly on Jason. It makes Bruce look like a moron that for some reason claims to love a kid he doesn't think highly of and threw him into the fight. Loeb also thinks that Jason is the same age as Dick which makes no sense. He was closer to Tims' age.
Johns: I forgot how negative the others Titans were in this issue. Jasons' time with the Titans was actually pretty positive, on his first mission he was the ONLY member that stayed focused. At one point he had to stop Donna from freaking out. Hell he saved Ravens' mom when she was under Brother Bloods' thrall and unlike the others actually checked to see if she was alive. Yet Johns has Raven claim he was obsessed with being better than everyone else? Or have Jason claim she sensed anger and tried to help?
SHE was the one that needed help back then! And no one even Dick cared enough to give him a statue? Superboy (Kon) even refers to Jason as the "bad Robin" at a later point. Still Johns did show some nice bonding between Jason, Alfred and Bruce in JL. He's learned from his mistakes with Wonder Woman so there's hope that he can write Jason better too.
Dixon: This is from the Nightwing Year One storyline. It has it's moments but Jason is often write as a stereotypical street kid. One example of his out of character writing is him shrugging off school like all that matters is crime fighting. When Jason was Robin he loved school, did an extra credit assignment that he loved and was at the top of his class because he worked hard. It should be noted there were more out of character moments in NYO like Dick not caring about Kory and Bruce being a psycho that kidnaps Jason.
I'm not sure how much of this was the writers disliking Jason, being affected by other retconned storylines or DC insisting Jason was Bruces' greatest failure yet blaming him for his own death. Whatever the reason it's really messed up that this is the way they wrote a kid that died a hero.