That's the hardest part in the game imo. Not because the trolls by themselves are incredibly hard to beat, but because they can destroy the objective you're trying to protect in seconds. I failed more on that section than anywhere else in the game. That fight is one of the few parts of the game where the AI companions just don't measure up. If you get lucky, your AI companions will keep one troll busy, while you take out the other troll. I figured out that they will ignore the object of thier wrath if you attack them on the way there. You can also make use of the dpad up command to get the AI companions to attack your target, then switch to the other troll. I just went nuts using skills over and over until I had one down. Chugging potions for power and health. I had to be really aggressive. There is collision detection, so standing in their way helps too.
Having coop help for this section would make it much easier. If I weren't traveling this week I'd be happy to fight those f'rs again. The good news is that there's nothing that hard for the rest of the game...even the ending.
+1 to that. I ended up switching to the dwarf and speccing him out for Taunt, and then just spamming it so they wouldn't go to the door.
finished up the rest of the game tonight. it was decent after a slow start, but doubt I'll be playing through on the next difficulty level.