Some players are in the HOF because they were good players on championship teams. Some should be, some should not be in. I don't think Namath should be. Hornung, well he did score a lot of points. Compared to todays players, I doubt he would make it. Does he benefit from being on a Championship team. Yes. Does he belong? Hard for me to say, I don't remember seeing him play. Namath, I remember watching him. Was never impressed with his play.
I was always under the impression that you got in for overall excellence on the field over a period of time. Now lately, if you don't win a Super Bowl you have to wait forever if at all. I know there are better players that are not in then some that are. I think part of the problem with the HOF is that the number teams have expanded over the years but the number of players allowed in has not. And it seems to me to be more of what your team did more than what you did these days. To say the least, I'm not real impressed with it anymore.
Favre will get in for two reasons, longevity/stats, and the two Super Bowl appearances.