It's quite funny to see people's reactions to this thread, particularly the people who are specifically talked about.
Not sure what Barney means by "lower end of A", but I checked his debates on here and they are worse than the ones on DDO. At a quick glance, he's only faced a couple guys with a positive win ratio. It's virtually all noobsniping. He's never been tested and I don't think he'd cut it in a top tier debate. I'd say he's like an 80th percentile debater.
RationalMadman has never backed up his big talk. He's lost the majority of his large debates and has proven time after time that he's simply not anywhere near the top. You look at his w/l ratio now and it's pretty bad. He's losing against mediocre debaters on the regular. I'd say he's like a 65th percentile debater.
Whiteflame's debates are clearly a cut above Barney's. He's always been mixing it with the best, and whilst he hasn't always won, he's been in the hunt. Just go and look at his most recent debates and most of them are against big names on the site. I'd say he's like a 95th percentile debater.
Thett is largely the same as Whiteflame. 95th percentile debater. Tejretics might be there, too.
I think the three who are guaranteed to beat Barney (in like a best of 10 debate format) are: Whiteflame, Thett and Tejretics. There might be others, too.