The problem with Disciples 3 was that it only retained the name of the original Disciples. The gameplay was reworked so much that Heroes 4 couldn't even compare. The numerous bugs are almost irrelevant; they were already a hallmark of Akella, but the gameplay overhaul was accompanied by a complete lack of balance, both in terms of factions and the game itself. Any campaign mission can be completed by using summoning spells for magical creatures, as they alone can defeat any enemy army. Plus, the AI is incredibly stupid. It has the ability to move around the battlefield, which is a new feature that wasn't present in previous games, and theoretically should be a key feature, but the AI attacks the NEAREST unit. Situation: two knights attack a troll, the troll attacks one of them. You move the damaged knight back one square, and that's it; the AI switches to the other knight. You can move the damaged knight back, and the AI will attack the knight it started attacking. Fail. Also, this is especially noticeable in single-player maps: there is no AI at all! Instead, the AI uses scripts. If you build unit production buildings for level 2 units in your castle, an enemy hero with a level 2 army will appear nearby. The fact that there were fifty neutral creatures along the path from the AI to you doesn't matter; they just stand there. The army simply appears out of nowhere. And that's how the whole game is designed. The expansion didn't save it; they added a beautiful and well-voiced undead faction, but the balance, AI, bugs, and all the other problems of the game remained.