What I look for in unique items is a few things
- Does the item change the way I engage enemies? (ie. allows me to attempt unique strategies). If the item in question is a damage modifier then the answer is no. If the item ,for example, imparts fire immunity for a turn then the answer is yes.
- Does the item have value outside of its numerical statistical values? For example in d&d a +1 sword is not as good as a +2 sword but if the +1 sword has the ability to add poison to its surface once per combat then it could be more useful in some circumstances.