You do know that over 50% of KDR pre 2.0 was because of bugs and molding right? The only reason you saw people switching classes left and right was because every few months they were messing with something...look at the Barb and Shaman back then compared to now, or even Guard.
I'm not saying people lacked skill, but some of the people who had insane KDR relied on the funcom bugs to do it. Molding being the biggest one...
And don't forget murderer farming, gem days, pug stomping, outnumbered kesh fights, siege only toons, ect...
There's a ton of factors that contributed to people's inflated KDR and the population's preception of these people back then. Some of thise same people who were considered good then came back as trash, so KDR doesn't mean anything as it's very easy to manipulate,