Archery mods made thaz gear the end all be all for archery mods from T8-T11, that is too good in my opinion. Double that with healing VI on the gloves which is super convenient and you don't replace those till Abyss or you aug your gear with +archery.
Thaz Ranger BP and gloves were the best available for the slot regardless of the archery mod, at least until Yclist/Abyss. Given that the content of Thaz was tier 8/9, I don't think that they were OP.
By my count, there are only 6 non-bow archery mod items left in the game between the tiers of 1 and 10 (http://wiki.shardsofdalaya.com/index.php/Archery#Modifies_skill) - and one of those is from Cmal 3 so maybe I shouldn't count it, although the stats are pretty good so I will. That's not a lot of selection.
The augs from Thurgadin and refuge probably help, though.