Grimoire score isn't an indication of skill directly, but it does indicate more time played which sometimes means a more skilled player. Before anyone starts to cite random example that don't fit the stereotype check out [url=https://www.reddit.com/r/DestinyTheGame/comments/3ivw3k/does_grimoire_really_correlate_with_skill_with/]this post[/url]. It shows that there is an actual link between higher grimoire players and a higher K/D ratio and raid completions. Edit:formatting