Expert take
Riven is an excellent pick if you want to carry from TOP lane, but she requires a mature approach: she should not be played as a simple combo champion. Her real strength comes from sequencing: keeping a spell for the response, choosing the right moment to activate R, playing around Q3, then converting side-lane pressure into a flank or objective. The player who improves with Riven is not the one who knows the most animation cancels, but the one who knows why they are entering, which cooldown they want to force, and how they get out if the kill does not happen. Drafted well, she creates constant threat; forced poorly, she becomes a fragile bruiser who spends everything just to touch a target.