For those wanting a more comprehensive guide to raider io:
The add-on provides VARIOUS metrics that are centered around experience. This does not necessarily tie with skill - parses do a better job of doing that - due to the fact that people can purchase carries.
So what experience does the addon provide about your character?
1 - It provides a boss completion for the current AND previous raid; along with the corresponding difficulty. Experience across multiple tiers.
2 - It provides a score for your M+ experience; approximately 10 * the level of key you’ve completed on time, and then summed up across all dungeons; so if you’ve timed a +10 key in all 10 dungeons, you’ll have roughly a 1000 score. You’ll get docked 10-20 points per dungeon when you fail to time it, and get a marginally better score when you beat the time by a decent amount.
3 - It provides all of this same information for your Main - should you choose to enable that functionality. So if you’re 5/8M with a 1.5k score on your main - and you roll over to you alt, a raid/party lead will be able to see your experience on the alt AND you main.
4 - It provides your best timed run.
5 - It provides the number of timed 5-9, 10-14, and 15+ keys. So you can tell if someone is consistent with timing keys, or if they are just starting to time them.
6 - Raider IO works BOTH ways! Yes - not only does it share information about your character to the groups you queue for, but you can ALSO see that same information for the leaders of those groups. So if you see a leader that/s 7/8N running a heroic raid- there’s a decent chance they’re just trying to get carried. Same with someone that has a 10+ key that has a score under a couple hundred. They could also be on an alt without the “main connection” functionality turned on.
So yeah - LOT’s of valuable information.
Is any ONE piece a direct indicator of how good of a player you are? Nope. But combined - they give you a much better picture of the kind of player you’re dealing with.
Logs always help as a tandem metric.
I highly recommend it if you pug a lot. It’ll help you make better (not perfect) decisions when inviting people; and can even help you avoid joining groups that are being led by knuckleheads looking for a quick carry.