ESPN ranked the top superbowl teams of all time, from #80 thru #1 including all teams that played win or lose.
The Eagles, with two superbowl appearances were in the middle of the pack...
The Eagles were a team that thrived on defense, allowing the fewest points and second-fewest yards in the NFL. They also had solid offensive weapons in Ron Jaworski (top passer rating in the NFC in his best season), Wilbert Montgomery (1,185 yards from scrimmage, 50 receptions) and Harold Carmichael (nine touchdown catches). However, Philadelphia loses style points for dropping three of its last four regular-season games and for going just 4-3 against teams with a record of at least .500. The Eagles had just three Pro Bowlers that season and no players who ultimately reached the Hall of Fame.
Donovan McNabb had his best season by far (104.7 QB rating) and Brian Westbrook and Terrell Owens, two of 10 Eagles named to the Pro Bowl roster, also had tremendous seasons. Two of the Eagles' losses came while resting their starters after a 13-1 start clinched home-field advantage for the playoffs. Their only other defeat came against the 15-1 Steelers. Their two playoff victories were by 13 and 17 points. However, this team was near the top of the league in just one major statistical category, fewest points allowed, and it played just two teams in the regular season with records above .500.
The #1 team? It's a no brainer in my opinion. The 1989 San Francisco 49ers.