First game I tried, I was the first to pick skills and I wasn't ready, and little did I know it auto-assigned one, and it gave me....Drow's ult...on Rooftrellen. I had even noticed that in the pool and been like "Boy that would suck to have as a melee."
Got a decent axe with Blink Strike, Hoof Stomp, Wraith King's stun, and Ursa's ult. Strong but not as imba as the things you guys are describing. Last game went against a Skywrath Mage who got DK's ult and it gave him something like 930 attack range. It was incredibly, incredibly lame. He also had Luna's passive and some other +damage passive, so in like no time he was around 120+80 damage attacking across the screen and the speed boost from dragon flight was enough that he could just attack all of us down even if we tried to run. It was gay.
Even so, Ability Draft is hella fun.