By Alex Marvez

Updated Sep 6, 2011 5:38 PM ET

The school year has just begun, but final grades for the NFL preseason are upon us.

RAMS

Record: 4-0

QB play: As evidenced by his five touchdown passes, Sam Bradford has taken to new offensive coordinator Josh McDaniels’ system faster than expected.

Breakout player: Tight end Lance Kendricks. The 2011 second-round pick capped a strong preseason with three catches for 73 yards and a touchdown in a 24-17 win over Jacksonville on Sept. 1.

Biggest concern: Cornerback depth. The Rams have little beyond starters Ron Bartell and Bradley Fletcher after losing nickel cornerback Jerome Murphy to a season-ending ankle injury.

Summary: Don’t expect the Rams to remain perfect for long in the regular season. St. Louis, though, is already proving itself the class of the NFC West.

Grade: A

The Whiners received an F by the way ... The Lions were the only other straight "A" as they went 4 & 0 as well in preseason ..