700 - 800 damage on a warrior (I assume 30% physical reduction) is indeed too much. Sure, it can be beneficial to buff the melee damage output of certain encounters, but i don't think Shade of Eranikus (SoE) is one of them.
Thrash
Level 55
The combination of both can be challenging on its own. People do the Temple when they are around level 51 (I think), 4 level lower than SoE. Crushing and critical hits occur more often, deadly with Thrash on most off-tanks. (or even main-tank)
Sure, you can try to kite, use defensive cooldowns, but that's not something you should or have to worry about when forming your group.
The WoW Bestiary lists SoE with a damage range of 508 - 673. This is the TBC version, only level 50. It is however quite easy to compute the proper damage range of the vanilla version (and other stats)
LVL 50 Shade of Eranikus
HP: 2215 -> 13 * 2215 = 28795
Min 84.6 -> 8 * ((27.5899) + (206 / 14)) * (1500 / 1000) = 508
Max: 112.2 -> 8 * ((1.5 * 27.5899) + (206 / 14)) * (1500 / 1000) = 673
Armor: 2999 -> 1 * 2999 = 2999
LVL 55 Shade of Eranikus
HP: 2614 -> 13 * 2614 = 33982
Min: 94.0 -> 8 * (( 30.7177) + (228 / 14)) * (1500 / 1000) = 564
Max: 124.7 -> 8 * (( 1.5 * 30.7177) + (228 / 14)) * (1500 / 1000) = 748
Armor: 3271 -> 1 * 3271 = 3271
In Vanilla, Shade of Eranikus had 33982 health, a damage range of 564.0 - 748.3 and 3271 armor.