For the start:
I did not play Descent V1 and I don't think comparing to the previous version would help.
So, my group and I were playing for some time now our several Descent V2 campains. (I have to explain, that we do own the first expansion) Unfortunately it was getting harder and harder for any of us as Overlord to win anything. Our heroes you kill nearly each monster in a hacking whirlwind of death. It even got worse in the second part of the campain!
Just to give you a clue: The heroes got to the final and killed the dragon (since they won previously nearly everything) in the FIRST round. And, just for fun, they killed the Lord in the same round. And I couldnt do anything against it (I never moved in this scenario).
But that is not the only problem, since you could always argue, that the OL just was played bad.
Worse, the Overlord does not have a "Wow" feeling. The heroes can buy cool stuff, which they get to use and to plan with. And what does the OL gets?
Cards. Which he may draw. Or not. This is not very encouraging, when everybody around you is looting, leveling and team playing and you only choose 1(!) card and perhaps you lose before getting to use it the next time!
This is just sad.
Are there any ideas? Is the second Addon making everything better?
Should the OL also get Skills, which he can lay out, use with Mana (e.g. with a limited amount of Mana each turn), get equipment, which he can give red monsters, and so on?