Leo is annoying but the worst is
dudes a bitch if he is good, only takes 1 Q. That displacements just brutal. nami cant react to it well. hits your adc? the blitz and adc are not in same space, hitting blitz is often to little to late, his E and R are already comeing out befor your Q or R connects, the enemy adc can be outside of your effective range. hits you? Your likely toast as the E and R are gonna come out and your adc likely wont have CC or position to stop enemy.
Other then that Nami is one of the best champions to carry as in support. Q has same CC as a Sona R, level 1 its 50% of the damage of a level 6 sona R. she gives ADC kite advantage, passive is free ms, E is free slow. She has the same amount of hard CC as a leo, on an aoe, and some soft cc. And she heals + pokes in the same ability.
Great champ, unless you struggle with QR and burn manna on EW at sub par times. Then a bad champ. She is good at all points in the game and just needs to position well to be relevant.
Glad your playing her thou. Gl and Hf man.