Rolf's max attack power is 61, which is nothing to laugh at. And Marksmen get both Deadeye (triple damage, pretty much always an instant kill) and boosted crit chance, so they're pretty effective when it comes to killing things, even from lower ground.
The problem with bowmen is that you can forgo all of them and not lose anything significant from your team (excluding Leo, you pretty much have to use him in chapter 1). Sure, Marksmens range of 3 is very useful, especially in the endgame, but you can get by just fine without them. And there are only a few usable ballistas in the game, as well.
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