I'm a support main, and I swear on my life, I'm going to eventually write a thesis on why I hate this champion so much.
She's only good when ahead, and sometimes your ADC's blatantly ignore your engages when they do happen. You can't opt out of going in like you can on Thresh or Alistar. I instantly regret it every time I lock in this champion.
SirArcticWarfare1 votesimo she is a unbreakable stun. which usually has a 100% champion lock down for about 7 Seconds. compared to thresh who actually requires skill (true fact) Leona literally has to point click
Lycanoon1 votesVery true.
Last time I played Leona, it was in an ARAM...and ironically enough, I kept being singled out and my team never followed through with my advances. So I in-turn started to capitalize on their rushes instead...and lemme tell you how fed I got after that lol
RIP Resonance1 votesIf you want lock down 
and point and click. I just think her armor needs to be buffed, or something. She's simply too weak. The only way I feel like Leona can be good is in a duo, or trio (jungler) premade where you have voice communication.