Can someone explain to me the logic behind Katarina and a few other champions
She has high mobility, high single (that does the same amount of aoe) burst, cooldown resets and is a resourceless champion that is perfectly viable in all phases of the game. Her only set back is that she is a melee champion but all her spells have extended range and she has a safe getaway with her E (that can also be used on wards) in case she does have to go melee range to cs or do damage.
Riven is the other example of a perfectly fine resourceless champion. Her and Kat never have to go back unless they run out of health pots. Not to mention Riven has outrageous AD ratios.
And while I'm here, nerf Lee Sin already. Too much mobility, too much ad ratios and high base damage.