Is Mark Sanchez a big time quarterback?

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I am a Jet fan and have been one since around 1963. The Jets gave up a lot to trade up in the draft to get Mark Sanchez believing he would be a franchise quarterback. The problem is, he's been playing for a few years now and I have to ask, how much has he really improved? It seems like he still has trouble reading defenses and throws to the wrong area, and then sometimes he follows his intended receiver too long with his eyes giving the play away. What do you think?