Uniques are so vastly under tuned right now, maybe 1/100 are worthwhile in a build. SOJ, BK Ring, Arachnid Mesh, Maras. The rest are middling items that are just trash as soon as you get high runes.
Here is my proposed solution:
Make the item-upgrades with Uniques universally scale with their upgrades beyond just their base damage. So if its an X to Fire damage as a normal weapon, make it XX to Fire damage as exceptional item, then XXX to Fire as a unique item. This would give whole new life to hundreds of items, Then let the PTR help you individually tune them after if things are too OP/Still not useable. For example Que Hagans wisdom would be +2 Skills, 40% FCR, 40% FHR etc. Viper magi +2 skills, 60% FCR, 40-70+ all res. They still wouldn’t replace enigma! Just a lot more usable items for endgame & a little less of a power gap between HR laden runewords.
The game is also missing tons of uniques. The amount of Elite items that don’t have uniques is wild. Like Scarab husk, Loricated mail, Diamond Mail, Great Hauberk, Archon Plate, Hellforge Plate, Lacquered Plate. Thats just the armor. Plenty of room to grow.