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In this thread, I propose we discuss the mission packs for "The Conquest of the Underworld." Overall, they are quite controversial, as there isn't much content (only one campaign each), and the lack of voice acting (at least for me) is a significant drawback. On the other hand, the diverse selection of missions in "Rangers" is interesting, and especially the "combined" mode of "Siege" and "Magic."
In the "Siege" and "Magic" campaigns, we control two armies simultaneously. In the "Siege" campaign, we are given armies of scouts (mostly reconnaissance light units) and cavalry (mainly cavalry and archers). The "Siege" missions are very challenging, and many require finding various ways to complete them.
In the "Magic" campaign, we control a small army of dwarves and another army... consisting of only the archmage Brennok :). However, the mission pack is called "Magic" because both the dwarf and the human can summon reinforcements (the former using runes, and the latter using the souls of elven warriors, including Gilven and Essentia). Moreover, the entire tactic is based on these reinforcements, which makes the game more interesting :).
In general, I will vote for "Magic" because it differs significantly from the previous installments, and the scale and complexity have only increased :)!