I've always thought of it as poor assault version of the Crusader in a way. Humaniod shaped mech. Because it was for Draconis Combine, Clans selling it didn't want to be too fantastic. I guess Clan Merchants didn't have any inner sphere double heat sinks around when they were making it.
There later variants have more potential, with the all Clan tech and double heat sinks. The Ha Otaku 2 is more anti-Combine arms mech, packing Plasma Cannon, Hypergauss Rifle 30, a Quad of ER Mediums and single LRM 10.
There also the prototype Ha Otoko-HR, has more well rounded feel to it. Adding endosteel, dropping the arm mounted LRMs for a ER Large Laser and ER mediums and the LRMs have Artemis IV FCS, which makes them more potent to lay in more missiles into the target. Experimental side of it i think is the inclusion of the AP Gauss Rifles to take out infantry and more likely Battle Armor. ECM nice touch too.