When implementing a performance monitoring system, its important to try and include what the suits call 'double loop learning'. In other words, you not only need to measure performance on the task (and act on that feedback), but also the performance of the performance measuring system. What that second feedback loop will tell you is almost certainly whats been said in this thread, but as formal feedback in your own context, rather than external comment. This can be handy for justifying changing things :-)