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To be fair, archers with double shot and a chance to push back based on initiative do have their advantages. But yes, few people use them. However, in combination with the unicorn bow, the blue archers are inferior to the first tier.
As for the "white" crossbowmen, yes, they are overpowered in skirmishes. But I still prefer the red ones... with their "wonderful" initiative of 8. I really felt those 8 initiative points in the first mission of the New Order campaign.
This campaign can be speedrun, but there's not much point in doing so. There's also the factor of knowing or not knowing the maps in advance. If I were to replay it, I definitely wouldn't make those mistakes in the fourth mission again.