Even though I'm no where near Wisconsin (or a Green Bay fan for that matter), Brett Favre has to be my favorite all-time football player. The first football jersey I ever got as a Christmas present when I was a kid (5 or 6), was a Green Bay, Brett Favre jersey; hell I even still have it somewhere around here! He was such a great athlete to watch game in and game out. He put smiles on countless numbers of fans faces year after year.
The only thing I'm not a fan of is when he retired, then came out of retirement, then retired again. If you are going to retire, retire! He could have retired at his peak (Green Bay), instead he came back and put on mediocre performances for mediocre teams...not a good way to go out!
As for my current NFL athlete, it has to be RG III. I'm a huge Redskins fan (based on my geographical location). Even though they are not off to a good start, RG III is one HELL of an athlete. He is very versatile at the QB position, being that he is a great pocket passer, and great at passing on the fly. Being able to scramble away when under pressure is a great trait to have - and man talk about speed! I feel like he will have a great season (statistic wise, even if the Redskins do not end up doing so hot), and a great career. I love watching him play.