Yes, Matt Stafford
No, Mark Sanchez
No, Jason Smith
Yes, Stafford was the correct pick. If anything he has displayed some nice toughness.
As far as quarterbacks go, they made the right choice with Stafford. However, I believe that it is better to build a football team from the lines outward, so I think that drafting a Michael Oher or a good defensive player might have been the right choice. By the time that Stafford would be reaching his prime, there is the possibility that he will have lost a lot of confidence from a couple of years playing with a mediocre line and defense.
The Jets team seemed close enough to being complete that a quarterback in the first round made more sense. At the beginning of the season they were projected to have a great defense, great offensive line, and pretty good receivers and runningbacks.