NFL rookies are 10-0 as starters. Roethlisberger is 7-0 but that is because his in a VERY good team with the league's best rushing offense - he simply isn't forced into situations where he could make several mistakes, especially when he only throws for 20 passes or so.
Craig Krenzel is 3-0, but this is a fluke, his last "victory" he completed 35% of his passes, threw for only about 100 yards and 2 INTs no TDs and they won on INT and special teams returns, a field goal and a defensive safety. (LOL, he's winning just like he did throughout his career at OSU)
It is a farce though, unless Manning is another fluke, he isn't going to save the team. Guys like Marino and Roethlisberger inherited good teams, everyone else struggles hard on their first year, heck just look at his brother, Peyton had a terrible first year but he's now on pace to crush Marino's untouchable records.
Eli is not the answer, the Bengals had it right sticking with Kitna last year and starting Palmer this year. Even when the Bengals started out looking really bad Marvin Lewis remained firm and has kept Plamer as the starter, they're now 4-5 under the 2nd year "rookie" after fans were calling for Kitna. You often have to take a losing season under a new rookie QB before you can start to expect big things. IMHO the right thing to do would be to leave Warner in for the rest of the year even it means a losing season, THEN you start Eli with his OWN season to direct instead of taking over for someone else's troops.
Roethlisberger was NEVER going to start unless the unfortunate injurry to Maddox occured, I was expecting another 6-10 type season for the Steeler this year with Roethlisberger learning the ropes. Even after this season I wouldn't have expected Roethlisberger to be so successful. And technically he isn't even THAT successful this season, his numbers aren't dominating, they are efficient. Perfect for a team that has everything else going for them. What would be scarey is if Pitt actually had a QB that was a dominant force (such as Farve or Culpepper or Manning) Instead they've got a guy like Brady who does enough to lead his team to wins, makes those occasional 3rd and 8s to keep scoring drives alive.
But who really knows, if the Giants take a page from the Steelers and focus on making sure the seasoned players can make some big plays and take the preasure off of Eli, then it could very well end up working out. However if they all of the sudden start to do that with Eli it will raise the question as to why they didn't do it with Warner, I honostly don't think it is entirely his fault.