So the Arkham Knight persona was absolutely pointless (SPOILERS)
If you think about, The game would've played out exactly the same if Jason just Started out as the Red Hood. But sadly what it doesn't change is the fact that "The Arkham Knight" was Falsely advertised and a huge Let-down
First off, Giving an already existing character a New costume does not count as Creating a Brand new Character as Rocksteady claimed they were doing, but nope they soldout and gave us probably the worst version of Jason Todd (which I will get too) and if anyone is going to defend this by claiming, they wanted to throw us all off guard, well if you take out the fact that RS said it would be a new character, (which didn't stop people from theorising who it would be) then its so Painfully obvious its Jason Todd.
Or if you claim, they just wanted to try and introduce the character to people who've never read the comics. well, odds are if they don't read the comic's they wont even know who Jason Todd is, not only that but it would honestly be straight up Bull from RS to false advertise a new character to comic fans and not full fill that claim just to try and catter to non comic fans.
Which leads to the "Let-Down" part of my argument, ARKHAM KNIGHT IS A BLOODY JOKE!!! throughout the whole game everyone keeps building up on what a momentous occasion Batman vs Arkham Knight would be, but what do we get, an over long Stealth Section, and once its over Jason just straight up disappears from the game all together up until the end, AND THIS IS THE GUY THE GAME IS NAMED AFTER!!! which shows even more False Advertisement, what happened to "Batman's Greatest challenge". and in then end Jason's sudden turn is a Complete ass-pull, he went through the trouble of Taking over a city with his massive army of A.I tanks and highly trained soldiers, and he just flips like nothing? it would've made since if him and Bruce actually had a conversation afterwords or something, but nope its all just set up for a 10min DLC which adds nothing new to Jasons character or the Plot over all it only exists because...KILL'IN PEPAL IS CEWL!!!
One last thing, The name "Arkham Knight" makes no since what does Jason have anything to do with Arkham Asylum itself, Nothing they just had to Shoehorn in the "Arkham" without it relating to anything else...