Comment by johnnyanmac

It's prone to its own biases, but I always figured the best metric was simply to ask how others on the team (or coworkers you need to work with) think of you. Your lead obviously has a bigger sway on this, but overall the idea is that you're generally doing a good job if the people around you overall see you as productive and feel more productive when working with you.

I can only really see an exception for some gnarly Principal who's off deep into some very specific problem where this evaluation would fall apart. But such an individual problably isn't one you're worried about productivity with.