Zeraph

Ashe (me) vs Nasus.

Vault- in the matches I play I've never had an Ashe dominate, lead in KBs sure, but never really carry a team. Yi can dominate, but not really till he's fed and till mid-late game. Early to mid game he's meh. Which is about right for a true carry. I'd say Yi is about perfectly balanced, Ashe I think actually needs a slight boost (get rid of the +gold skill and add some sort of close ranged burst dps skill or an increase in survivability but not killability by maybe giving her a knockback arrow similar but weaker to tristanas ult).

So far my experience has been that the truly scary carries are well played (emphasis on the well played) shacos, tryndameres, and twitches. Shaco is seeing a big increase in popularity for some reason even though he's only had a very minor buff to jacks fear radius. Anyways, they all have the ability to get early reliable kills, as well as the ability for TPK (total party kills).

Ashe is like teemo, elusive and good dps but they lack the ability to plow through entire teams and go down very easily if caught unlike the above.

PS Joz looks like im going to beat you to 30 I'm 28 already! (I still don't think I'm as good as you though >< )