Look, I'm a Pats fan but I can't hold that 2007 team in the same light as the '85 Bears, '84 Niners, '79 Steelers, etc. because they didn't win it all. Its about the ring, first and foremost, and that is how history tends to remember the best teams of all-time.
Leading up to SB XXXVI, people were calling that '01 Rams team one of the best of all-time. Now, when you discuss great NFL teams, those '01 Rams don't come up in the conversation because they didn't win it all.