I have been using that combo since lvl 25 when I got order. My Law on my True Vault Hunter play through is awesome. Does like 4k damage. Can't wait to get order cause having only 1300 shields this late in the game is rather difficult.
My play style so far with it is to deception back stab a dude then circle him while slashing with law. Get bonuses for moving while attacking, plus crits if I can get them, plus additional dmg if I can get to their back. The health regen is enough so that I only die if I get knocked back and can't get to the enemy fast enough. Also, I get mad second winds while roid raging on the ground with the enemy standing over me.
Then humanity pops up and creates things like bombs and the internet. The earth was probably like, "WTF is this ****?"