If you played League of Legends solo queue in Patch 14.9, you know that Jinx is currently one of the best champions. But that could change when Patch 14.10 comes out.
NEW PATCH 14.16 CHANGES! – League of Legends
According to stats site U.GG, Jinx currently has a 25.2 percent pick-and-ban rate and a 21.7 percent ban rate in Emerald and above, bringing her overall presence to 46.9 percent. This is a high pick-and-ban rate considering she's a hyperscaling carry with no means to peel enemies or escape from sticky situations.
Jinx, like other hypercarries, doesn't come online until she builds her third item. Her build usually consists of Kraken Slayer, Infinity Edge, Runaan's Hurricane or Rapid Fire Cannon, Lord Dominik's Regards, and Bloodthirster.
In Patch 14.10, Riot Games is reworking marksmen items and removing Lethal Tempo entirely. While some top laners like Tryndamere have used this rune, Lethal Tempo is primarily a marksman rune (and one of the main reasons Jinx was able to dominate Summoner's Rift).