Here is a list of parameters I could come up with (I don't necessarily use these to judge others)
Married college sweet heart
Owns a Car
Owns a house
Gave up job to pursue dream/passion
Excelled in any other field
I score pretty less in all above departments (except maybe the last one) but then I am not competing :P
Also while listing this I realized we often use such parameters to judge people we don't know well but not our close friends. Our friends, we revel in their success however small and grieve for their losses. For us they are always winners. Next time I brand someone as a failure, I'll remember that person could have been a friend.