In a SS's case, they are much more accurate than a 1B's case, and i also take into consideration (As i have stated many times before) what my eyes see when rating a fielder. I've seen Scutaro play SS a decent amount of times and he's not in the league of a Rollins, a Hardy, a Gonzales, an Andrus or an Erick Aybar, just to name a few.
And let's be honest, any metric is better than Fld% or errors.