Ok, so i decided to do some tests with rogue tank.
Hearth Orlean, base stats at level 12
http://i.imgur.com/ysLKisw.jpg
Every rogue here is missing (they were done in tavern and i was too lazy to add every talent):
Galvain's Boon - +1 Mig
Blooded Hunter - +1 Slash and Pierce DR
Song of the Heavens - +1 Per, +2 Shock DR
Dungeon Delver - + 0,1 Crit Damage multiplier (it's not gonna be visible anyway)
Gift from the Machine - +1 Mig, 1,05 Max End multiplier
Mob Justice - +5 Acc
OR
The Merciless Hand - +0.3 Crit Damage multiplier (it's not gonna be visible anyway)
OR
Second Skin - +2 DR
Equipement (best stuff i had before jumping into Breith Eaman, if you have something better please post):
Dandy Hat of the Diseased Yak - +2 Res, -1 Int
Lilith's Shawl - +3 Per
Sanguine Plate - +2 Dex, Superb
Rabbit Fur Gloves - +0,1 Crit Damage multiplier (it's not gonna be visible anyway) (Spirit Spiral - 1,05 Melee Damage multiplier are another option, on Oidreacht only +1 max damage)
Ring of Deflection - +10 Deflection
Pensiavi Mes Rei - +3 Mig
Boots of Stability (vs push/prone, idk if Bile Stompers are not better with +5 Corrode DR)
Gridle of Eotun Constitution - +3 Con
Draining Weapons (i add Corrosive when possible on my weapons):
Tidefall (Great Sword) - Superb, Corrosive
Purgatory (Sabre) - Superb, Corrosive + Little Savior - Superb (+25 Def and no Acc loss)
Oidhreacht (Stiletto) - Superb, Corrosive + Little Savior - Superb (+25 Def and no Acc loss)
Edge of Reason (Battle Axe) - Superb, Corrosive + Little Savior - Superb (+25 Def and no Acc loss)
Edge of Reason and Oidhreacht still have 2 enchant points (can take any Slaying Enchant except Kith). I didn't test The Rose of Salthollow (Superb, Corrosive) because imo there is no point in using it if you have Tidefall.
Stats with eq and talents/skills (all modals ON, no other buffs):
Tidefall
http://i.imgur.com/iDaEFOJ.jpg
Purgatory + Little Savior
http://i.imgur.com/QE2QZJw.jpg
Oidhreacht + Little Savior
http://i.imgur.com/ilP70Tz.jpg
Edge of Reason + Little Savior
http://i.imgur.com/nqwmaZm.jpg
For testing i did solo runs in Breith Eaman (last place with mobs for me, clearing Defiance Bay was way too easy):
1) Tidefall - Low Deflection and verry slow attacks. Way too low dex imo.
2) Purgatory + Little Savior - amazing, with buffs from the rest of the party - invincible.
3) Oidhreacht + Little Savior - Endurance gain is low but with proper buffs it cant be pretty solid. Slaying enchant available.
4) Edge of reason + Little Savior - almost the same as with Purgatory (with lower damage). Slaying enchant available.
Imo, rogue tank could be fun to play with. Focus on damaging talents at start, switch to tanking mode after Riposte. Getting the proper gear might take some time (Ruffian is the best option here, Oidhreacht drops on the first level in Od Nua, switch to Purgatory after that). I could switch few damaging talents for more Deflection but we have warrior tanks for that.
Moon Godlike is another option (+1 dex and int are useless, healing is not that great too).