And I am going to pile on the Hussar and agree with all of the above. Plus, to get the flank bonus you need to expose another unit by sending them behind the lines.
Not so. IMO, the appropriate use of Hussars is (1) move one Hussar next to an enemy unit; (2) move a second Hussar next to an enemy unit; (3) attack with both Hussars to get the flanking bonus for both of them; and (4) move both Hussars to safety. Don't forget about their movement and sight bonuses. These extra bonuses do wonders for setting up the attack.