Right, so I gave K-3P0 a go against one of my good friends. I ran:
K-3P0
Han Solo on a Tauntaun
Luke Skywalker on a Tauntaun
Chewbacca of Hoth
Hoth Trooper with Atgar Cannon
My friend had:
Blizzard I
Rampaging Wampa
Wampa
Probe Droid
Ugnaught
We played on the Echo Base map from the Battle for Hoth pack. My friend got to the gambit area first with the wampas. I made my way forward leading with the Tauntauns.
I don't really use Thrawn that often, so a couple of times I was trying to switch different bases before I remembered that I couldn't do that. But switching the Atgar was pretty cool. I eventually got Luke up to the door and then swapped the Atgar in for an attack on the Wampa. I rolled a 14...
Too bad, it would have been nice to see some splash damage.
My friend made a couple of placement mistakes and I was able to get a cunning attack off on the Probe Droid with Han, but he was able to win initiative anyway. A twin attack from Blizzard I took care of my cannon but instead of burning an activation with the ugnaught and letting the door shut my friend kept the door open with the Rampagaing Wampa. I couldn't make him pay with either Han or Luke but Chewie got a nice shot in with Deadeye.
Anyways, long story short, he won on points when time ran out. We decided to play the game out anyway. Some bad rolls prevented the AT-ST from totally wiping out my team, and I was able to squeak out a victory.
K-3P0's actually pretty fun to use. And I got to try my Atgar for the first time ever and actually got an attack of, even if it didn't hit. I was afraid it would be defeated before I had the chance to even do that. Oh well, good times...