I am not familiar with Fitocracy but it seems to be getting much love here. Part of my dislike for tracking and measuring fitness might come from my experience with cumbersome apps that make the process a pain. I used Fitness Buddy for a period, and found it way to complicated and in-depth to make tracking how much weight I lifted and the reps quickly between exercises. I'll give Fitocracy a shot, and see if I change my mind.

As a side note, I do like tracking how much I walk, but not for debugging, but for motivation. I'd like to hit a 100 miles before the end of the year just by walking at lunch, but for no other reason that personal pride I guess.