I'm still waiting for Barkley to have as good a year as the one Sanchez had in '08. Barkley's playing with far better surrounding talent as well, the talent level on this USC offense is absurd, especially with the addition of Redd. Woods and Lee are both 1st round receivers and the offensive line Barkley is playing behind is awesome, even with the loss of Kalil (the '08 line was the worst USC's had in the last 9 years).
In his year at USC, Sanchez had a YPA of 8.8, the best Barkley has managed so far is 7.9 (8.2 through 2 games this year). For context, all 3 of Luck's years were between 8.7 and 9.0, and Stafford's last year he posted 9.0. Luck's ypa numbers are the most impressive because he did it throwing to TEs. Matt Ryan was only at 7, but he was playing with scrubs against more talented opponents.
Barkley is a very conservative QB. He's a far more conservative thrower than Sanchez was, or Leinart, or Palmer, or even Booty,]. But he's the blonde-haired boy wonder from Mater Dei, so he'll have a greater legacy at USC than any of the guys that came before him. (To his great credit, he also shepherded the program through the probation years and was a 4 year starter)
**One thing that stands out about Barkley if you watch him enough: He throws the best corner fade of any college QB I've ever seen. He's also had a lot of practice throwing the back shoulder fade that's become so popular in the NFL (but hasn't really caught on in college yet).
There's a lot to like, but he's not tank-the-season good. And he's another 6'2" QB, for the people who think Sanchez is too short.