Quand utiliser un Bullet Chart
You are reporting against targets
Revenue against plan, tickets closed against goal, uptime against the SLA. The target tick sits right on the bar, so the comparison needs no arithmetic.
You have a scorecard of several KPIs
A column of bullets stays readable at ten or twenty rows, where the same number of gauges would be a wall of dials.
The measures use different units
Each row can be scaled on its own, so a margin in percent and revenue in thousands share one chart without the small one vanishing.
Context matters more than the raw number
The bands tell the reader whether 82 is a good result or a worrying one, without a legend of thresholds.