"Thus, by creating a direct correlation between in-game power and time spent grinding, every player will at least have the potential to reach the top 20% (although the Pareto principle will still apply to the amount of time spent grinding)."<p>This is like translating your time and effort into worthless in-game currency (reputation in game). At least if it was based on real life skills like accuracy and response times, you could train these real life skills and get benefits in and out of game.<p>Call of duty rocks, no need to grind (as long you're not trying to level up). I can just hop in and dominate. I imagine that people who play Call of Duty online are the least likely to also play World of Warcraft regularly.