Although most of us, I suspect, prefer guild runs, most of us also have to PuG it up every once in a while. LFG can be a bit of a crap shoot; you can get an Ulduar-geared player doing 3,000 DPS in your heroic, or a fresh 80 who has a thing or two to learn doing 1,000.
Fortunately, we have the Armory to help us separate the good from the bad, or at least the geared from the ungeared. Sites like Be Imba and WoW Heroes have been around for a while to help us more easily check a character's gear level.
Now a new site, PUG Checker, can show you at a glance what bosses a character has killed, and how many times - or rather, what bosses they've been present for a kill of. Above right you can see what it shows for raids on my priest (I don't like Malygos very much). If you click "show bosses," you can see specific raid bosses in raids; otherwise, it just counts kills of the end boss. It uses Armory data, of course, which is pretty accurate, but not always perfect. Like the site says, "don't shoot the messenger" if the numbers aren't quite right.
Like Be Imba and WoW Heroes, this isn't an infallible guide to whether a player is good or not. It does probably correlate to some degree, though. In fact, if PUG Checker just added the average ilvl of the equipped gear of the person I'm checking, it would be my go-to site for checking puggies. It does load data much quicker than either of those equipment sites, which alone is enough that I will probably use it. I also really dig the clean design and the number-circles that look like subway indicators.
[via My Life as a Cartoon]