Coldstrike Campaign only adds 3 levels and just a few new enemies.
The Bad: Only 3 levels, everything else is the same
Not much can be said about this DLC for Renegade Ops. This closes off the story with just 3 levels and a couple of new enemies, but everything is the same, and that's not really good or bad. If you couldn't take anymore after the end of the main game then 3 extra levels may or may not kill you. The biggest change is the ice cold scenery, but the overall design of the levels runs the same.
The final boss fight with Coldstrike is very challenging and even harder than Inferno was. The same problems consist with the repetitive nature of the game. The objectives are not any different from the main game, but if you really like the structure of this game then this DLC is a must buy for you.
The new enemeis consist of a new huge bad boy called a Golem (replaces the Juggernauts) as well as turrets that fall from the sky, and just "re-texturing" of old enemies. There are a few scenes where you are running from missile drops that will break ice under you, but that's as exciting as it gets.
For the low price you get an hour's worth of fun action, but you can go back through with friends to experience it all again. With just 3 levels and barely anything new it doesn't add up to a "campaign" and more like well...DLC.