heh well zexxi doesn't get much kills when he ran that with me either, so maybe not the best comparison.
And DC50 is using things like house d potions, abishai cookies, store pots, ..Things that aren't exactly available in easy unlimited amounts. So in that regard, I think they shouldn't be balanced against.
But without that, the DCs are 45ish.. Which should be balanced against better. There's no reason why it should just work just becayse you TR'd once and have a +4 tome. It's too easy. Heavy use of debuffs should be required to have much succcess versus the tougher mobs.
And yea, players like us who chewed up and crushed the original epic versions that the devs deemed too difficult obvious don't have much of a challenge left in this new dumbed down versions. Oh well. At least the bosses haven't changed too much.