Reading through the forum, I saw that many people are disappointed by the way the game scales.However, i believe that its scaling mechanics don't really suck. Below are posted some things that haven't been mentioned by anyone and I'd like to discuss on them.
1.In games with 2 heroes each monster has 2 fewer wounds than its version in a 4-player game. Consequently, don't you think such monsters can be killed with weaker starting weapons?
eg.: In a 2-player game, a beastman has 2 wounds and 2 armor. Thus, it is possible that a dagger or maybe a sword instead of an axe can do the trick.Using a dagger, the average hero will roll 3 hearts+power dice+skills+fatigue.The beastman is dead. That way, tanks can opt for daggers, not for axes, runners for bows and not for crossbows and mages for mage staffs not for immolations.This will result in saving 50-75 coins for every hero and supply them with extra potions.
2.In a 4-player game, it may be unlikely that opening a chest will provide everyone with suitable equipment. On the other hand, in a 2-player game, even a weapon which is not suitble for a hero will be able to kill the weaker monsters.
eg.: Mad Carthos gets the Dwarven Fire Bombs. Attacking a sorcerer, he needs 5. Blue die:1-2+green die: 2-3+fatigue= dead sorcerer.
3.Taking point 2 into consideration, heroes with split trait dice will be much better than heroes with 3 dice in one trait.
eg.: In a 2-player game, Mordrog attacks a razorwing with his axe and needs 6. Red die: 2-4+ green die:2 +power dice: 2-3 +skills:2 .Total 8-12. Now take Red Scorpion with a sword: red die: 2-3+ green die:2+ power die:1+ skill (if any):2+ fatigue= 6-7 damage. Again enough. Now imagine that Red Scorpion can do this with any weapon while Mordrog will have to rely on his short-reach axe .
4.Particular hero combos can make some of the Overlord's powers useless.
eg.:If using the Tomb Of ice expansion, Zyla ( http://www.descentinthedark.com/_z_/zyla.php ) + Shiver ( http//www.descentinthedark.com/_s_/shiver.php ) will make melee attack monsters useless. Cautious skill+ Spiritspeaker Mok= low threat.
To sum up, although fewer heroes ultimately favor the Overlord, I certainly don't believe it is impossible to win a 2-player game.