pokertracker numbers that everyone uses

[daryn]

i always see everyone talking about so and so, who is a XX/XX..

does this really tell you anything? first of all, over how many hands? what if the guy just caught some hot cards over a few thousand hands? now you think he's a maniac. also, what if the majority of hands you have from him came from 3 handed play or something?

what would you say if a guy was a 30/20?