Both DLCs broken! *Updated, works now!*
It doesn't matter if you start a new Campaign either. I have the Item DLCs too and I already found some of them so they work so far. It's a shame really because the game itself is awesome, great story, great dialogs, ... But if you want all Trophies you will need to solve the DLC quests too.
Maybe the DLCs are good but until they solved the problem not worth spending money on...
Update:
Ok, got the problem fixed with a tool called DLC Decrypt. (If the publishers don't get it right ask the hackers *g*)
The additional character is pretty good and you get some fun moments (i.e. his bird phobia) and some extra mission and dungeon. The Golem also has another Item system (Large crystals as armor and small crystals as weapons, defined by the quality and type, like flawed fire crystal) and a lot of new abilities.
I would give it a higher rating if it wasn't for the problems it made and the fact that it was finished when the game was released. I understand DLCs like Return to Ostagar, that were made after release but they sell you an incomplete game. It won't prevent piracy at all... The best example is the Return to Ostagar DLC that's not even officially released but it's availlable on every torrent site...