From: ChocoboDreams | #007 Support only sucks for the fact that when you're lane-partner is undoubtedly terrible, there's nothing you can do to carry that lane. Specifically, when you're Leona.
This is why you cant pick leona every game. Leona has very horrible match ups. You cant expect to get kills 24/7 when playing leona. She cant sustain, so if the enemy can poke you at all, gg, you basically lost the lane for your adc just b/c of who you picked. She also cant poke at all, so basically you have to rely on your ADC to do the poking if you are getting poked... and good luck with that in solo queue.