I have always ran across a few people who have higher grimoire than me and think they are better at me than the game. To be honest, I think those people go to Destiny Tracker and grind all day for +5 Grimoire each time. The real question here is this:
Does Grimoire really tell who you are?
My opinion: Sort of
Edit 1: Seems like we are having a contest here about who has the highest Grimoire even though this wasn't the main point. (Max=3665)
Edit 2: Like this post if you agree with my opinion
Edit 3: Some people have been telling me that I grind for Grimoire. That is not true as I stopped at 3550. It may be high but that is because I played the game a lot since day 1. Never wasted time killing 250 ogres ect..
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Well if you have max grim then you know that person has to have done the 50 raids (full raids) and 100 wins in each crucible type (including rumble where you can't really be carried) that's really the only time you can for sure have a high probability of a player being good at the game