I loved Arkham City, so by proxy, I also "love" Arkham Origins. It's essentially the same game, just different villains. Very little else is different.
That pretty much covers the positive. The biggest negatives I have with this game is that the controls are a little wonkier, and gliding sucks. Without using the fast travel option, getting around town isn't necessarily difficult per se, but it's definitely more difficult than it needs to be.
The game looks good, but is pretty much the same as Arkham City. That's a good thing, if you loved AC, in which I did. But Origins just feels like DLC, with a slow uninteresting story and even bigger and dead city. I didn't get very far before I just lost interest in this game.