For the first couple of days my skirmishers died in droves.

They have to be correctly supported to get the maximum effect from them.

Good unit, yes. God unit, no. Able to be overcome, absolutely. (Who in their right mind would rush them head on with cavalry, or send no dachi or warrior monks at them unscreened?)

With proper tactics, they can be dealt with. And yes, their range is pitifully short.