Having managed several teams in big corporate environments, I have to agree that the squeaky wheels are the ones to watch out for. I learnt this because early

Having managed several teams in big corporate environments, I have to agree that the squeaky wheels are the ones to watch out for. I learnt this because early on, during performance reviews, I had a sixth sense that I was shafting the quiet ones so I put together a performance metric system based on impact of work. What I found was that the quiet ones were more productive and caused the least negative impact compared to the self-aggrandizing ones. I shared this system with everyone on the team with their own data and slowly the squeaky ones started to transfer out while the team continued to improve productivity and quality because the quiet ones were happier.