My party is currently level 8, just started exploring level 5. The overall theme is "defense is for sissies." I have no points in any defensive skills on any of my characters. Dead enemies are easy to tank. Here's what I've got so far:
Human Fighter
28 points in Swords
38 attack power, 38 accuracy
15 protection, 23 evasion
Resists: 14, 8, 8, 14
111 HP, 68 Energy
Aggressive, Healthy
16 Str, 16 Dex, 14 Vit, 10 Will
Human Rogue
32 points in Unarmed Combat
31 attack power, 44 accuracy
17 protection, 53 evasion
Resists: 41, 16, 61, 41
111 HP, 64 Energy
Agile, Fist Fighter
10 Str, 22 Dex, 15 Vit, 10 Will
Minotaur Rogue
29 points in Missile Weapons
45 attack power, perfect accuracy (bow)
15 protection, -13 evasion
Resists: 0, 14, 14, 0
96 HP, 78 Energy
Aggressive, Head Hunter (2 skulls)
20 Str, 8 Dex, 16 Vit, 10 Will
Human Mage
19 Ice Magic, 18 Spellcraft
15 protection, -8 evasion
Resists: 0, 34, 14, 0
108 HP, 146 Energy
Strong Mind, Healthy
10 Str, 10 Dex, 16 Vit, 22 Will
The noteworthy things here are the Unarmed Rogue on the front line who would beat the crap out of my Fighter and take his lunch money, and the Minotaur archer Rogue.
Most people don't seem to realize that daggers are for the back row; your Rogue will never be a first string tank if you use daggers. Unarmed gives you a truckload of tanking perks without anything in Dodge.
The other thing that doesn't seem to have sunk in yet is that Minotaurs make the best archers. Dex doesn't do anything for bows; they have perfect accuracy to start with, and Strength affects damage for bows the same as it affects melee weapons. Get Head Hunter and Aggressive to max out your attack power, and put every point you've got into Missile Weapons. Back row characters don't need to worry about survivability much, but Minotaurs have plenty of that.
The Fighter is a balanced attribute swordsman, who will branch over into Armor once he's got 50 points in swords. I'll put heavy armor on him eventually. The Mage is a pretty generic Ice Magic type. He's nothing too special. I usually have him just throw a shuriken at each enemy because one regular attack from the rest of my party is enough to drop most enemies I've found so far.
I'm tempted to start over and run a group of four Rogues just to show that they're not underpowered, you just have to build them right (no daggers on the front lines, no Dex on your archers). My front line Rogue does almost as much damage and tanks far better than my Fighter does, and my Minotaur archer is just ridiculously powerful.