Expert take
Tristana is an excellent choice if you want an ADC who can decide the game through conversion, not only raw DPS. She rewards players who recognize the right moment: when the wave allows a plate, when a target can be finished, when an objective can fall before the enemy responds. Her difficulty is not purely mechanical, but decision-based: the same Rocket Jump can be a decisive reset or a free death. If your draft gives you crowd control and at least some protection, she becomes a very reliable turret and teamfight threat. If you must create the opening alone, she loses a large part of her value.