Quick answer: When every bug claims to be priority one, none of them are. A scoring system (severity, frequency, blast radius, fix cost) breaks the tie.
Priority one means urgent. Urgent for everyone means urgent for no one.
Severity (1-5)
How bad when it happens. Sev-5 = data loss. Sev-1 = minor visual.
Frequency
How often. Per-session = high; per-month = low.
Blast radius
How many players. 100%; 10%; 1%. Multiplier on severity.
Fix cost
Engineering hours. Cheap+impactful = priority. Expensive+marginal = backlog.
“Priorities need math. Math beats opinions.”
Establish a scoring formula; calibrate quarterly. The formula evolves with the team; the discipline persists.