Because the unit stats and battle mechanics are balanced for Medium battle difficulty. What faction are you playing?
If you're finding battles too easy, chances are you're using some combination of always using full stacks (try 15 units), too much cavalry (more than 2 units as a settled faction), too many elites (more than 1 unit per stack), too many archers (more than 2 units), too much heavy line infantry, and/or targeting the enemy general to cause a general rout. I often find when people make this complaint, they use full stacks comprised almost entirely of heavy cavalry and heavy infantry, with little or no skirmishers, when a more balanced force would not only be more interesting to play, but more challenging too.
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