[{quoted}](name=Franco Sanchez,realm=NA,application-id=3ErqAdtq,discussion-id=E17PkXgI,comment-id=000300010000,timestamp=2015-02-07T17:53:24.839+0000)
It's not as good as you are making it out to be. Leona's damage is primarily tied to her passive. She also doesn't have the tankiness to walk out of an extended trade particularly unscathed (as with her 3+). The only time that she can really have a good lvl 2 is if you have the kill potential for an all in.
she has a gapcloser, two forms of cc, and an easy two passive procs that puts her damage well above average. that's much more than most champions have at level 2.
sure, she doesn't have everything in her kit BECAUSE SHE'S LEVEL 2. no one has their entire kit at level 2, and tankiness doesn't matter if you have the advantage and the enemy has to run, which is the reason that a leona lane should try to push to level 2 ASAP and jump on a squishy. then the enemy has two choices: run with their tail between their legs and maybe get away at low health and minus a summoner spell or two, or stay and fight because leona isn't quite as tanky as she'd be a few minutes from now, but still lose because leona has level advantage, damage advantage, and she locks you down with a snare, stun, and maybe exhaust if she feels that's necessary.