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Now, as for the dwarf archers, there are some own specific problems. The second level doesn't shoot fundamentally harder than gremlins; it's just that they can cripple (I like to split them into several squads at the start of the game—that way there's a better chance to cripple), and the 5th level is also great mainly because of its health; though, the cross-attack of the upgraded ones combined with a fire wall is already quite good
But overall, due to their inability to deal normal damage, dwarves didn't really click for me. (In broad strategic terms) I usually prefer to develop attack for the hero and rely mainly on non-retaliating hits—ranged shots, finishing attacks, etc. It's not always the best tactic, but it doesn't work at all with dwarves. The absolute nightmare is when dwarves fight against dwarves. It' same scary to imagine what a fight between two dwarf armies is like, especially when each hero has a super-ability... that would take about a couple of days...