Let us not forget that Starr also called all the plays. Other than Peyton Manning (I can't believe I mentioned him in this thread...argh!!!), no current era quarterback has had that responsibility, much less done so well with it.
Favre had physical skills that Starr never had. He could do things to complete passes, to keep games going, that Starr never could have done. Starr didn't have Favre's 40 speed or his elusiveness. He knew how to evade contact and was physically adept enough to avoid a lot of bad hits that would have, and did, put Starr out. Starr not only didn't have Favre's passing stats, he could never have had them because he wouldn't have been able to stay as healthy as often.
I do believe, however, that Starr, would have excelled in any era including today's.
It's no accident that the only player in recent NFL history who can be talked about in the same breath (sort of) as Starr with respect to championships, is Joe Montana. My guess is that Montana, were he transplanted back to the Lombardi era, would probably have done pretty well. (I do *not* think Favre or Manning or Brees or Brady would have.) But I do think Starr would have excelled under Walsh and Seifert.
Was Starr aided by all the Hall of Famers on his team? Sure. But anyone who thinks he couldn't have one more than one title under Wolf/Holmgren I think is mistaken. The only thing that would have stopped him from doing so would have been injuries.
He would never have been as durable as Favre. But would he have been durable enough? I think so. He survived the Deacon Joneses and the Carl Ellers and the Alan Pages and the Dick Butkuses and a whole lot of others who were just as tough, just as hardhitting as anyone today.
Again, IMO, Hutson is #1. Starr is #2.
Everyone else is vying for #3.
Until someone else "redefines the game" or approaches Montana/Starr numbers, it'll be a distant third.
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
Romans 12:2 (NKJV)