Vinny Testaverde had the most games by a quarterback with a passer rating below 90.0, with 166 games.

most below 90 qbr games for qb incareer
Interpreted as:
most below 90 qbr regular-season games for qb incareer
TestaverdeFavreHadlTarkentonHartManningCollinsElwayMarinoUnitasFergusonMoonBledsoeTittleSneadRoteBradyDeBergMortonGabrielParilliFoutsEsiason166160146146144142142142140135131129126126124123121121121121120119118
NAMEGPRATECMPATTPCTYDSAVGYDS/GTDTD%INTINT%SCKSCKY
Vinny TestaverdeVinny Testaverde16663.32,6634,98253.531,5856.3190.31513.02374.83052,195
Brett FavreBrett Favre16064.63,2265,63357.334,7606.2217.31552.82714.82982,035
John HadlJohn Hadl14651.51,6723,54147.222,4916.4154.01273.62416.8
Fran TarkentonFran Tarkenton14659.12,1334,02453.024,6906.1169.11273.22245.6
Jim HartJim Hart14453.51,8433,82448.223,7286.2164.81122.92245.9
Eli ManningEli Manning14267.72,7544,92655.931,2736.3220.21412.92014.12571,787
Kerry CollinsKerry Collins14262.02,4394,59953.027,2835.9192.1992.21783.92511,693
John ElwayJohn Elway14262.02,3824,53252.628,1706.2198.41072.41924.23282,398
Dan MarinoDan Marino14070.72,7764,98755.733,0606.6236.11633.31953.91601,114
Johnny UnitasJohnny Unitas13557.91,7743,44851.523,0376.7170.61113.22126.1
Joe FergusonJoe Ferguson13150.91,5613,19948.818,5825.8141.8762.41845.8
Warren MoonWarren Moon12965.62,3384,28454.627,9686.5216.81202.81904.43232,434
Drew BledsoeDrew Bledsoe12661.42,3644,46353.026,2075.9208.01022.31814.13262,167
Y.A. TittleY.A. Tittle12654.21,4052,69352.217,6126.5139.8953.51967.3
Norm SneadNorm Snead12448.21,5173,14148.319,6496.3158.5912.92257.2
Tobin RoteTobin Rote12344.61,0662,46943.214,3915.8117.0973.91837.4
Tom BradyTom Brady12172.22,4304,23257.426,3636.2217.91253.01373.22451,550
Steve DeBergSteve DeBerg12158.91,8993,53153.821,5476.1178.1922.61875.3
Craig MortonCraig Morton12153.01,2842,59949.416,0216.2132.4783.01626.2
Roman GabrielRoman Gabriel12160.81,6163,26549.519,0755.8157.61043.21374.2
Babe ParilliBabe Parilli12045.31,1092,51544.115,1476.0126.2923.71867.4
Dan FoutsDan Fouts11963.21,9793,59555.025,2467.0212.21012.82025.6
Boomer EsiasonBoomer Esiason11862.11,7243,26652.820,5546.3174.2902.81524.72151,665
Archie ManningArchie Manning11857.01,5382,90652.917,4836.0148.2822.81655.7
John BrodieJohn Brodie11753.21,5983,14050.918,9516.0162.0882.81946.2
StatMuse has game-level data for passer rating going back to the 1950 season.

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