Yeah, fiery arrows aren't useless. Forest fires are pretty common and do a lot of damage to a stronghold if your workers don't put it out in time.
Good points on the stats. We haven't done a whole lot of balance fine-tuning yet, but we probably will be swapping some of those stats. And yeah, walls probably aren't the best place for mounts.
I just brought in everything I had to stop the orc horde.
And when you said upgrade archers .... does that also apply to wardens since they are half workers?
Sometimes. Most upgrades increase a stat for all of your units. But there are some that are only targeted at specific types - like the distance upgrade only increases the range of Rangers.