[whaahhahahah]

the biggest fish stat is probably hands played. they don't have this as a rule, but if you only rate people with x amount of hands then you can tell if someone hasn't played much. amount won could help you tell if the person has played a bunch of hands though

i don't like the stats they provide for the rules because they don't sort for position -- the most telling are probably

-pf raise %
-went to sd %
-turn aggression

for good players

and

-volume put in pot
-went to showdown %
-turn aggression

for poor players

if you sort for winning and losers players at your level, you should be able to come up with good values pretty easily