Even though you'll see from different perspectives, you'll be playing as Batman in this game nonetheless. Depending on the difficulty, you have to contend on how many hits they can handle, both henchmen and tanks.
There will be lots of gameplay aspects to contend with. Free flow combat is slightly harder, predator or stealth is getting more complex and driving the Batmobile and using the grappling hook could take a lot of practice. Still, there will always be a way to get around all those issues, once you get into the habit of upgrading Batman and his Batmobile.
Lastly and the most perplexing, throughout the story mode, because you've been tainted by Joker's blood, even though Joker is already dead, you'll see him play in your mind a lot. In other words, as you play through the game, Joker will comment and pound you with his knowledge of the things you've been through together on opposite sides. Thankfully, people can't see Joker from your perspective and he won't really block your progress no matter what you do. After all, you get to block him out of your mind near the end. You just need to control Joker in his fantasy land until the shows nearly over.
So are you ready to be Batman one more time? This walkthrough awaits your arrival.