Because he was only the starter for one season in college.  His draft stock was artificially inflated because he played at a high profile school (USC), but he has not proven his ability to perform on a high level against elite competition over a long period of time. He will be exposed in the NFL.

Because there is no such thing as a Mexican quarterback in the NFL. THEY TOOK URR JIBBS!!!

Because the Jets drafted him. Not only did they draft him, but they traded up to a higher position in the draft to get him. Remember when everybody said it was a good idea for them to give up on the rest of Chad Pennington's career for one season of old Brett Favre? Chad Pennington led the Dolphins to an 11-5 record and a division title. Brett Favre led the Jets nowhere. The Jets suck.

Because 60% of all quarterbacks wash out in the NFL. This prediction is right more than half the time even if you didn't tell me that we were talking about a Mexican who wanted to be quarterback for the terrible New York Jets. (took ur jibs)

And because Mel Kiper Jr. gave the Jets an A- on his draft report card. Not only that, but he called Mark Sanchez a "franchise maker". Not unless the franchise is a Taco Bell!  Jesus will punish the Jets as his way of punishing Mel Kiper Jr. for spending his life preparing meaningless mock drafts for ESPN, which I am then forced to listen to, because I am ESPNs monkey.