Joe Montana is the greatest quarterback of all time along with being the best NFL player ever due to his great regular season numbers and an unmatched ability to come through in the playoffs and in the Super Bowl.
In his legendary 15 year career, Montana threw for 40,551 yards, 273 touchdowns, and 139 interceptions (1.96 to 1 ratio), with a 63.2 completion percentage and 92.3 QB rating, along with 20 rushing touchdowns.
He was selected to the Pro Bowl eight times and the first-team All-Pro team three times. He led the league in completion percentage five times, touchdown passes twice, and QB rating twice.
He won back-to-back MVP awards in the 1989 and 1990 seasons.
Montana's best season was in 1989 when he threw for 3,521 yards, 26 touchdowns, and eight interceptions (3.25 to 1 ratio) with a 70.2 completion percentage and a 112.4 QB rating. His aerial assault went along with 227 rushing yards and three touchdowns in just 13 games.
Montana is No. 1, though, because of great performances in the postseason and in the Super Bowl. He went 16-7 in his postseason career as a starting QB.
He threw for 5,772 yards, 45 touchdowns, and 21 interceptions (2.14 to 1 ratio), with a 95.6 QB rating, in addition to 314 rushing yards and two touchdowns.
Montana led the 49ers to four Super Bowl victories, winning every time he made it to the "ship." His total Super Bowl numbers are 1,142 passing yards, 11 touchdowns to zero interceptions on a 68.0 completion percentage, and 127.8 QB Rating, along with 101 rushing yards and two touchdowns.
He had at least a 100.0 QB rating in all four games.
His worst performance in the Super Bowl was his first one, when he threw for 157 yards and only one touchdown to zero interceptions. The performance was still good enough for a 100 QB rating, and he managed 18 rushing yards and a touchdown.
Finally, he had a game-winning, 92 yard drive to defeat the Bengals in that game.