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Joe Montana's QB GOAT case starts here. At the peak of his powers at age 33, the 49ers icon was on his own tier in 1989. His completion percentage (70.2), yards per attempt (9.1) and passer rating (112.4) look confusing when compared to his peers. Apex Jerry Rice (17 TDs), Roger Craig and John Taylor made 1989 the West Coast Offense's masterwork, despite Bill Walsh having retired after the '88 season. The defense ranked third, too. The 49ers went 14-2, losing by five total points, and obliterated the Vikings, Rams and Broncos by a 126-26 margin in the playoffs. George Seifert's debut team may be the NFL's best ever.