Been playing her some in the PBE, and she is ridiculous with someone like Fiora. You increase her damage and movement speed and cause them to apply a slow on hit, which is everything Fiora wants to engage or disengage with. Additionally, the way her W bounce works you want to cast it when people are bunched up. Throwing it at Graves will hit him and maybe you, because his support will walk away. If you throw it at Graves while Fiora is stabbing him, it will hit Graves, Fiora, and his support.
Jax can carry a game but I doubt he can do it while laning on bot vs a ranged and a support, even with Nami --- If Raptor Jesus is your lord and savior and you are 100% proud of it, copy this into your signature.
No. Glass melee carries die too easily, and if you don't build glass cannon you don't do enough damage. Lose-lose.
Step 1: Build life steal (Bloodthirster, Blade of the ruined king) Step 2: Build Ravenous Hydra Step 3: Build Sword of the Divine Step 4: Build Mercurial Scimitar
Ok, so SotD gives you 3 guaranteed crits at 100% attack speed. Combine that with your tons of damage and your cleave, and you are a lifesteal tank that hits their whole team. They can't run from you because you have Ruined King. They can't stun you because you have Mercurial.
It's pretty viable.
Addendum: Ohmwrecker gives you tons of sustain and makes it harder for caries to do damage to you bot lane while you dive them and kill them over and over again, but I haven't seen that one first hand and can't comment on if it works or not.