Man, a chance to assess myself! How did I miss this thread earlier!!
I'd vote myself as somewhere around the 'I'm an alright debater'. I think if the topic is in my sphere and I have sufficient time RL, I can compose a pretty good argument, and I can do it formally or informally. I prefer informally...more fun that way.
I'd also give myself points for actually listening to the other party/parties, and responding. I'll occasionally misunderstand, but I don't ignore the uncomfortable bits. Makes no sense to, since I'm here to learn (and tweak Sterling Archer's giblets when given the chance).
Interestingly, I'm a reasonable debater in RL (again, not great, but decent), but I'd go about composing my arguments in an entirely different manner. One thing that happens here is that people can fact check, and swamp an argument with links to hour long You Tube videos. RL, succinctness is important. Believe it or not, I can create a succint and coherant argument when I need to. Just amuses me to think other people out there are trawling through my drivel.
If anyone wants my opinion on their debating skills, let me know. I can't guarantee accuracy, but I CAN guarantee I'll make it up.