Warner owns the three most prolific passing days in SB history, and led two of the most pathetic NFL franchses to the SB three times. Both franchises went right back to dogshit when he left. He's one of the most accurate passers ever, is among the all time leaders in yardage despite only starting for seven seasons, and led the league in yards, TD's, %, and rating multiple times. He's a two time league MVP and a SB MVP.
What else was he supposed to do? That's not a "full career"? Hanging around and playing three more years would have sealed the deal for you? Worry about what he did, not how long it took.