I haven't taken any of my games so far very seriously. I know that's not the best attitude but I didn't realistically expect to rocket to 1800 with half blues and 400 resilience. Now that I'm at ~650 res and almost full purples I'm going to be doing a *lot* more games. With the experience I've had so far, as Ualaa pointed out, I think the basic strat is this:

Charge immediately once you've got a target. Zerg them down. Hungering Cold on the DK and if they trinket immediately Repentance splash on arenatarget1-4. Rinse/repeat, using Deathgrip to pull in runners.

So, I need:

1. Gladius
2. Better cleanse/HoF macros
3. Some skill