I'll agree with this also.
Just this morning, a level 14 monk pm'ed me if he could get into my party for elite running with the devils... Usually that's a rough quest, so I try to get people who know it etc etc... So I was skeptical at first. But he said he could do it and my group was pretty much going shortman (fighter, fvs (me), wiz\rog).
And let me tell you... everyone in the party had multiple deaths and he didn't die once. And not because we had to overheal\babysit him. He must have stunned every cleric in there as well. And with only around 250 HP! (can't remember if it was 220 or 280)
So tactics\smarts > HP, definitely.