I played pretty much fine this game campaign mode. But then at chapter 3 I get zerged. I think this game is too hard, because you manage nice and well like a daywalk, then suddenly an army appears and you are slaughtered. I checked web and there was some hints, but I don't think it is fine like that. The difficulty level should rise steadily.

Wish I could get zerg'd. I am stuck with the bug where the portal that leads to medusa doesn't want to disappear, so I am running around everywhere trying to find the trigger, before finding out that the bug is well known and never fixed, and either you have to restart the mission or just wait for it eventually disappear.

Actually, it would be more accurate to say this is the first real mission. This is the first one where you have an opponent AI who gathers and builds. As soon as you exit Khyber, he gets activated. Success in this mission largely depends on two things.
1. Getting all affairs in order before use the Khyber exit by the shrine. This means finishing all quests, spending all exp/dragonshards, as you will soon not have time to do so.
2. Constantly using all your squad abilities in combat. Make sure all auto-use abilities are on, and fire off the rest as best you can. Simply attack-moving will probably have you lose most of your forces. Using all abilities as fast as they recharge, you won't take losses at all.

Edit: dwmattcv, you did follow the ghost and get the idol, right? The barrier is up til' then.

@IronWyrm

Thanks for the info. Will keep this stuff in mind when I get to that point.