What do you mean "fighting for it?" That's it's an optimal jungle pick just like Lee Sin, Olaf, Gragas, J4, Amumu, Zac, Kha'zix, etc.? That anyone with decent Tristana and jungle skills should be able to climb in ranked with it if they practice it enough? That you shouldn't be flamed for it in normals?
I can tell you right now Tristana is not an optimal type of champion for jungling in Solo Queue, let alone competetive. And of course you shouldn't get flamed for playing weird/off-meta stuff in normal games.
As for whether you can climb with it if you're better at Tristana than other jungler's? I'm not sure, but I feel like the handicap you're setting for yourself is probably not worth it unless you're literally a Tristana+jungle one-trick (you know, several times as many games on Tristana jungle in ranked as all other champions/roles combined).