Originally Posted by gvaness
Yes. I feel very confidant with about 6 characters. I will play ranked with them. I feel adequate with another 20-30, I play normal with them. How can ELO really show your skill level when you are playing champions that you have vastly different experience with?
Because my ELO shows on the whole how good I am at the game of LoL. It means that if I play with 9 other people of approximately the same rating, both teams will have an even match.
Besides, I would never be remotely comfortable entering a game of LoL (ranked or otherwise) where I wasn't prepared to play at least ~20 characters. Otherwise I might have to counterpick myself if 3 of my best characters are banned, 2 are in lanes that are full, and the last is hard-countered by my lane opponent.