My impressions in the beta were: Get out as much dmg as u can and get damaged the less you can. No matter if you are melee or ranged. So there is no use in going tanky for solo pve. Just go all out dps and cc your opponents, dodge/block the dmg or burst them down quickly. I was able to do solo dungeons 2-3 lvls above as 2handed dk while wearing mostly light armor, for example. And we finished the first dungeons with a group of lvl 10 (templer heal), 11(dk melee-dps), 11(dk tank), 12(templer melee-dps), all thrown together by the groupfinder.