Four weeks in the 2012 NFL season, and just like that, a quarter of the league-year has elapsed.
The San Francisco 49ers (3-1) have a .750 winning percentage right now, which is good enough to have them near the top of the league. Coach Jim Harbaugh is no doubt proud of his men, but understands there is still tons of work to be done.
The team looked exceptional in three of their four outings in 2012, but laid an egg in one of them. The 49ers won convincingly in Weeks 1 and 2 against two highly respected playoff teams from last year, in Green Bay and Detroit.
To the fans' surprise, the product on the field this year is not too different from 2011's personnel. Despite some offseason additions, the San Francisco 49ers have been winning these games with much of last year's roster. Ask any 49er fan, and they'll agree that it's been the Vernon Davis and Frank Gore show.
The Niners also returned all 11 of their starters on defense.
Here, we'll discuss San Francisco's offseason acquisitions and assign each a letter grade to this point. Continue through the following slides for the list, as you may be surprised who earns the highest grade.