I wish the ranger-skill applied to the skyhawk mistwalker unit too. They're more "shadow warrior" than "ranger", but lore-wise somewhat close (from a certain light). The ranger unit just doesn't work well late game, so it's a bit of a wasted skill point. Not good against large units, no armour-piercing so can't really take out armoured infantry, and can't stand up to (or run away from...) end-game cavalry.