I have covered the NFL for 14 years and reported from four Super Bowls. The statistic I see misused most consistently in quarterback evaluation is the traditional passer rating — a metric developed in 1973 that has significant limitations for evaluating modern quarterbacks. Understanding why passer rating falls short, and what better metrics exist, changes how you watch and analyze quarterback performance. Here is the honest guide.
NFL passer rating (officially called the Total Quarterback Rating before ESPN introduced QBR, now sometimes called the traditional passer rating) is calculated from four components: completion percentage, yards per attempt, touchdown percentage, and interception percentage. Each component is scaled and capped, and the four are averaged to produce a number on a scale of 0-158.3. A rating of 100 was originally considered excellent; the league average has risen over time as rule changes favoring passing offenses have elevated completion percentages and yards per attempt across the board. The problems with traditional passer rating: it does not account for yards after catch (YAC) — a receiver turning a short pass into a long gain inflates the quarterback's statistics. It does not account for drops — a quarterback can throw an accurate pass that is dropped, lowering his completion percentage without any fault. It does not account for performance under pressure, time to throw, or offensive line quality. And it treats all touchdowns and interceptions equally regardless of game situation.
ESPN's Total QBR (introduced in 2011) is a significant improvement over traditional passer rating. It attempts to account for situation (down and distance, field position, game score) and assigns credit or blame based on expected points added rather than raw statistics. QBR also attempts to separate receiver contribution from quarterback contribution. The limitations: QBR is a proprietary metric whose exact calculation ESPN has not fully disclosed, which limits independent verification. It has known issues with how it handles scrambles and designed quarterback runs. And the situational adjustments, while conceptually sound, involve judgment calls in their implementation.
Air yards and intended air yards separate what the quarterback does from what happens after the catch. Air yards measures the distance the ball travels through the air on completions; intended air yards measures it on all attempts including incompletions. A quarterback who averages 8 intended air yards per attempt is throwing downfield more aggressively than one averaging 5, regardless of what the completion percentages show. Adjusted net yards per attempt (ANY/A) is a simple formula that better accounts for touchdowns and interceptions than traditional passer rating: (yards + 20×TDs - 45×INTs) / attempts. It correlates strongly with team winning percentage. On-target percentage (available from various analytics sites) measures what percentage of a quarterback's throws are accurately placed, independent of whether they are caught. PFF (Pro Football Focus) grades quarterbacks on individual plays with adjustments for pressure, receiver performance, and route difficulty — a more granular but labor-intensive evaluation approach.
Beyond the statistics, the things that experienced evaluators look for in quarterback film: decision-making speed and accuracy in the pocket, performance under pressure (when blockers are beaten), the ability to go through progressions rather than locking onto the first read, accuracy at all levels of the field (short, intermediate, and deep), and performance in late-game, high-leverage situations rather than garbage time. The best quarterbacks make their teammates better — this shows up in receiver performance relative to their performance with other quarterbacks, and in the ability to find mismatches rather than defaulting to the star receiver on every play.
Honest Bottom Line: Traditional passer rating is a flawed metric — it does not account for YAC, drops, pressure, or situational context. QBR is better but proprietary and imperfect. The metrics that tell you more: adjusted net yards per attempt (ANY/A) for a simple improvement over passer rating, air yards and intended air yards for separating quarterback contribution from receiver contribution, and on-target percentage for accuracy evaluation. The best quarterback evaluation combines multiple metrics with film study — no single number captures what makes a quarterback elite.

David Thompson is a sports journalist with 14 years of experience covering professional and amateur athletics across three continents. He has reported from four Olympic Games and numerous World Cup tournaments. David bri...