Blind Fight is a classic under appreciated feat that useful in any melee orientated build early.
Allows you to target invisible (etc) enemies with at least a "chance to hit".
It never looses effectiveness i.e. some background feats tend to be valuable early in a build but less so latter on (Blooded comes to mind).
Now having said that there are spells and items with "True Seeing" (~ 6th level spell) which can assist you but inevitably you have to be 11th level for the spell or wait till you are powerful enough to acquire such a magical item.
You are still likely to meet and target enemy spell casters with ie. Darkness and Ghostly Visage spells before you acquire true seeing.
Further even if you acquire the spell slot/item with true seeing having Blind Fight allows you to use that "spot" for other useful buffs / enhancements.