This is seriously misleading. Brady, Roethlisberger, Wilson all won SBs before they were great QBs. Manning won one after he was no longer very good at all. The fact that Brady, Roethlisberger, and Manning are HOF QBs does not change the fact that they won SBs as average or worse QBs.
Brady took a 5-11 team and went 11-5 and was leading a game winning SB drive his 2nd year in the NFL, maybe he wasn't throwing for 40 TD's or winning MVP's but he was building his HOF resume early on. Big Ben had an excellent rookie year and helped his team go 22-3 his 1st 2 years along with posting a combined 98.3 QBR his 1st 2 years which at the the time was 3rd best in NFL history for the 1st 2 years of a QB behind only Marino and Warner. Wilson made the Pro Bowl his 1st two years and tied Manning's rookie TD record with 26 along with being 1 of 3 QB's in NFL history to throw for 20+ TD's their 1st 7 years tying Marino and Manning.
Posting big pretty numbers is not the only way to be considered a good or great QB. If you're doing things things that put you in the same company as Warner, Manning, Marino than your well on you way to being considered more than just average.