This is what all the cool-aid drinkers are missing in this thread. You can feel like you worked your ass off, or you can feel like you've been coasting, and still get the same performance review. I've seen genuinely valuable engineers get middling performance reviews because they didn't commit as many lines of code to Github that quarter as the other guy on their team.

That's an extreme example, but even in a "good" system, management is notoriously blind to the actual value of an engineer. In a perfect system, performance could be measured empirically and compensation would be based on that. But no one on earth has figured that out yet, and something tells me they never will.