Zero actually was quite a challenge. Honestly, I liked Mordecai better, but I'm not much for melees. However, Zero with Law and Order just isn't fair, lol.
I actually have two Greeds. One's a TwoFer, which is great for close/mid range, but it's not accurate enough for long range. The other's a Bowie which is accurate as heck, plus has a knife on it so gaige can melee crysalysks.