Batman: Arkham Origins - Cold, Cold Heart Review (xboxgamer13)
This is the only great dlc and which you should get if you like origins.
The "Cold, Cold heart" dlc adds a new campaign where batman has to stop Mr. Freeze.
The campaign is pretty short and the map too, but it adds some nice new content, like the XE (extreme environment) suit which you get to use in the campaign and a new enemy (just thugs with a freeze ray)
It also adds new collectables like, frozen victims and Anarky followers riot.
At the end you fight Mr. Freeze (duh) in a boss fight... but to be honest I thought it was meh.. On the first phase Mr. Freeze just stands in one spot looking for the player, if he notices you he'll just fire his freeze ray. There is also regular enemies and all you have to do is find 3 generator and overheat them or something like, then Mr. Freeze proceeds to the next phase. Where Mr. Freeze (and some other enemies) will start looking for you over the map, you need to use diffrent takedowns to, wel, take him down.
In conclusion, you should get this dlc on sale or something.