So who is this unknown guy we sometimes talk about?

[Allday Everyday]

I am wondering what kind of player the usual, standard, unknown online SS full-ring LHE player is. I know they are all different, but what would be the usual tendencies among most players?

What kind of features of play would you assign to an online player you had never played or even seen before? At 2/4? 3/6? 5/10? What kind of stats would you credit him with?

What kind of assumptions do you make abount an unknown player before you make decision in a hand against him?